C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42...

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A B C D E F opc Inst. addr cycles Logic 00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0 *SP := PCL; SP -= 1 F8 57 0 0 10 0 *SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10 PCL := *fCP; DPL += 1 80 74 0 0 0 0 PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0 IR := *PC; PC += 1; END.INT 0 8 0 6 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 01 ORA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0 T := *zDP; DPL += 1 50 44 0 0 10 0 DPH := *zDP 10 42 0 0 10 0 B := *DPt B0 22 0 0 10 0 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 02 KIL imp 2 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 03 SLO X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0 T := *zDP; DPL += 1 50 44 0 0 10 0 DPH := *zDP 10 42 0 0 10 0 B := *DPt; ML C0 22 0 0 10 0 DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0 *DPt := DPL FA 22 0 0 10 0 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 04 LDD zpg 3 B := *zDP B0 42 0 0 10 0 IR := *PC; PC += 1; END 0 8 0 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 05 ORA zpg 3 B := *zDP B0 42 0 0 10 0 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 06 ASL zpg 5 B := *zDP; ML C0 42 0 0 10 0 T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0 *zDP := T F5 42 0 0 10 0 IR := *PC; PC += 1; END 0 8 0 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 07 SLO zpg 5 B := *zDP; ML C0 42 0 0 10 0 T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0 *zDP := T F5 42 0 0 10 0 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0 DPL := B := *PC; PC += 1 0 0 0 0 0 0 C74 - 6502 Microcode

Transcript of C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42...

Page 1: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A B C D E F

opc Inst. addr cycles Logic

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

01 ORA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

02 KIL imp 2 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

03 SLO X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

*DPt := DPL FA 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

04 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

07 SLO zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C74 - 6502 Microcode

Page 2: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0B ANC # 2 A := A AND B; SETF(NZC); IR := *PC; PC += 1; END.ARNC A0 8 8D 7 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0C LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0F SLO abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

12 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

13 SLO ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

Page 3: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

*DPt := DPL FA 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

14 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

15 ORA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

16 ASL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

17 SLO zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1B SLO abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 4: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1E ASL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1F SLO abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

21 AND X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

22 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

23 RLA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

*DPt := DPL FA 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 5: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

27 RLA zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2B ANC # 2 A := A AND B; SETF(NZC); IR := *PC; PC += 1; END.ARNC A0 8 8D 7 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2F RLA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 6: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

32 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

33 RLA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

*DPt := DPL FA 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

34 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

35 AND zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

36 ROL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

37 RLA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Page 7: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3B RLA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3E ROL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3F RLA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

41 EOR X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 8: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

42 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

43 SRE X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

*DPt := DPL FA 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

47 SRE zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4B ALR # 2 A := A ALR B; SETF(NZC); IR := *PC; PC += 1; END A0 8 8D 24 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 9: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4F SRE abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

52 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

53 SRE ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

*DPt := DPL FA 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

54 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

55 EOR zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

56 LSR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

Page 10: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

57 SRE zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5B SRE abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5E LSR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5F SRE abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 11: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

61 ADC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

62 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

63 RRA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

*DPt := DPL FA 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

64 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

67 RRA zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 12: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6B ARR # 2 A := A AND B ROR; SETF(NZCV); IR := *PC; PC += 1; END.ARNCA0 8 8E 2F 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

PCL := *DP; DPL += 1 80 14 0 0 0 0

PCH := *DP 90 12 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6F RRA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

72 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

73 RRA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

Page 13: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DPt := DPL FA 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

74 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

75 ADC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

76 ROR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

77 RRA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7B RRA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

Page 14: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7E ROR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7F RRA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

80 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

81 STA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

82 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

83 SAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A&X FE 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

87 SAX zpg 3 *zDP := A&X FE 42 0 0 10 0

Page 15: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

89 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8B XAA # 2 A := X AND B; SETF(NZ); IR := *PC; PC += 1; END A3 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8F SAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A&X FE 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

92 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

93 AHX ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

Page 16: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DPt := A&X AND DPH+1 EE 22 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

94 STY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

95 STA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

97 SAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := A&X FE 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9B TAS abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A&X AND DPH+1 EE 12 80 0 10 0

SP := A&X; IR := *PC; PC += 1; END 2E 8 8 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9C SHY abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := Y AND DPH+1 E4 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 17: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

9E SHX abs,Y 05 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC) 10 32 C8 18 0 0

*DP := X AND DPH+1 E3 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9F AHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A&X AND DPH+1 EE 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A1 LDA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A3 LAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

X := *DPt 30 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A7 LAX zpg 3 X := *zDP 30 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 18: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AB LXA # 3 X := B 30 2 C8 0 0 0

A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AF LAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B3 LAX ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 19: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B5 LDA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B7 LAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

X := *zDP 30 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BB LAS abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

AXS := SP AND B; SETF(NZ); IR := *PC; PC += 1; END 62 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BF LAX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

Page 20: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C1 CMP X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C3 DCP X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := B - 1; SETF(NZ) B 32 FC 80 0 0

*DPt := DPL FA 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C7 DCP zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CB AXS imm 2 X := A&X SBC1 B; SETF(NZC); IR := *PC; PC += 1; END 3E 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 21: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CF DCP abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D3 DCP ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

DPL := B - 1; SETF(NZ) B 32 FC 80 0 0

*DPt := DPL FA 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

Page 22: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D7 DCP zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DB DCP abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 23: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DF DCP abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E1 SBC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E3 ISC X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt; ML C0 22 0 0 10 0

DPL := B + 1; SETF(NZ) 0 32 C 88 0 0

*DPt := DPL FA 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E7 ISC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

Page 24: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EB SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EF ISC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F0 BEQ rel 2++ PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F3 ISC ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt; ML C0 22 0 0 10 0

Page 25: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B + 1; SETF(NZ) 0 32 C 88 0 0

*DPt := DPL FA 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F6 INC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F7 ISC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FB ISC abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 26: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FF ISC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

01 ORA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

02 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

03 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

04 TSB zpg 5 B := *zDP; ML C0 42 0 0 10 0

B := *zDP; T := A OR B 50 42 E8 0 10 0

*zDP := T F5 42 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 10 0

Page 27: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

07 RMB0 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0C TSB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := A OR B 50 12 E8 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0F BBR0 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 28: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

12 ORA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

13 NOP1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

14 TRB zpg 5 B := *zDP; ML C0 42 0 0 10 0

B := *zDP; T := !A AND B 50 42 48 0 10 0

*zDP := T F5 42 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

15 ORA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

16 ASL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

17 RMB1 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1A INC A 2 A := A + 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 29: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1C TRB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := !A AND B 50 12 48 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1E ASL abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1F BBR1 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

21 AND X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

22 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

23 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

Page 30: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

27 RMB2 zpg 5 B := *zDP; B0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2F BBR2 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 31: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

32 AND (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

33 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

34 BIT zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

35 AND zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

36 ROL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

37 RMB3 zpg 5 B := *zDP; B0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3A DEC A 2 A := A - 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 32: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

3B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3C BIT abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3E ROL abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3F BBR3 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

41 EOR X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

42 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

43 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

Page 33: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

47 RMB4 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4F BBR4 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

Page 34: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

52 EOR (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

53 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

54 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

55 EOR zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

56 LSR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

57 RMB5 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5A PHY imp 3 *SP := Y; SP -= 1 F4 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 35: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

5B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5C ??? ??? 8 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5E LSR abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5F BBR5 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

61 ADC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

62 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

63 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

64 STZ zpg 3 *zDP := 0 FB 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 36: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

67 RMB6 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6C JMP (abs) 6 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6F BBR6 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

Page 37: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

72 ADC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

73 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

74 STZ zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := 0 FB 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

75 ADC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

76 ROR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

77 RMB7 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Page 38: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7A PLY imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7C JMP (abs,x) 6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7E ROR abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7F BBR7 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

80 BRA rel 3* PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

81 STA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

82 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

83 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 39: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

87 SMB0 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

89 BIT # 2 A AND B; SETF(Z); BIT; IR := *PC; PC += 1; END B0 8 8B 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8F BBS0 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 40: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

92 STA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

93 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

94 STY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

95 STA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

97 SMB1 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

Page 41: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9C STZ abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9E STZ abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9F BBS1 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A1 LDA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 42: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A7 SMB2 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AF BBS2 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 43: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B2 LDA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B7 SMB3 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Page 44: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BF BBS3 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C1 CMP X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C2 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C7 SMB4 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 45: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CB WAI imp 3 WAI; IR := PC; PC += 1; END D0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CF BBS4 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D2 CMP (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 46: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

D4 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D7 SMB5 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DA PHX imp 3 *SP := X; SP -= 1 F3 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DB STP imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DC LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

Page 47: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DF BBS5 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E1 SBC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E2 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E7 SMB6 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 48: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EF BBS6 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F2 SBC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 49: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F6 INC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F7 SMB7 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FA PLX imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FC LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 50: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

FF BBS7 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

01 ORA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

02 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

03 SLO X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

04 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

07 SLO zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 51: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0B ANC # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0C LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0F SLO abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

12 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 52: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

13 SLO ind,Y B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

14 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

15 ORA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

16 ASL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

17 SLO zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1B SLO abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 53: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

1C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1E ASL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1F SLO abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

21 AND X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

22 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

23 RLA X,ind DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 54: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

27 RLA zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2B ANC # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2F RLA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Page 55: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

32 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

33 RLA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

34 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

35 AND zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

36 ROL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

37 RLA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 56: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3B RLA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3E ROL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3F RLA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 57: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

41 EOR X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

42 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

43 SRE X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

47 SRE zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4B ALR # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 58: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4F SRE abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

52 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

53 SRE ind,Y B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

54 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

55 EOR zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

Page 59: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

56 LSR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

57 SRE zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5B SRE abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5E LSR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 60: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5F SRE abs,X 7 PC -= 1 0 33 0 0 0 0

DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

61 ADC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

62 KIL imp 6 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

63 RRA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

64 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

67 RRA zpg 5 B := *zDP B0 42 0 0 10 0

Page 61: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6B ARR # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

PCL := *DP; DPL += 1 80 14 0 0 0 0

PCH := *DP 90 12 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6F RRA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

Page 62: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

72 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

73 RRA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

74 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

75 ADC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

76 ROR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

77 RRA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7B RRA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

Page 63: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7E ROR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7F RRA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

80 LDD imm 02 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

81 STA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

82 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

83 SAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 64: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

87 SAX zpg 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

89 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8B XAA # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8F SAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

Page 65: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

92 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

93 AHX ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

94 STY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

95 STA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

97 SAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9B TAS abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9C SHY abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

Page 66: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9E SHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC) 10 32 C8 18 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9F AHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A1 LDA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A3 LAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

Page 67: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A7 LAX zpg 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AB LXA # 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AF LAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B2 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 68: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B3 LAX ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B7 LAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BB LAS abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

Page 69: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BF LAX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C1 CMP X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C3 DCP X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C7 DCP zpg 5 B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 70: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CB AXS imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CF DCP abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D2 KIL imp 3 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D3 DCP ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

Page 71: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D7 DCP zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DB DCP abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

Page 72: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DF DCP abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E1 SBC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E3 ISC X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

Page 73: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E7 ISC zpg 5 B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EB SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EF ISC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

Page 74: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F2 KIL imp 3 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F3 ISC ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F6 INC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F7 ISC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FB ISC abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

Page 75: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FF ISC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

00 BRK “Sig" 9 *SP := PBR; SP -= 1 FB 57 0 0 31 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL; SP -= 1 F8 57 0 0 30 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 30 10

PBR := 0 BB 2 8 0 0 1

PCL := *fCP; DPL += 1 80 74 0 0 30 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 30 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

01 ORA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

02 SPI # 10 SPI (ALU PASS B) BB 2 C0 0 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

Page 76: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0; IR := *PC; PC += 1; END A0 8 A8 54 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

03 ORA d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

04 TSB zpg 5 B := *zDP; ML C0 42 0 0 30 40

B := *zDP; T := A OR B 50 42 E8 0 30 40

*zDP := T F5 42 0 0 30 40

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 30 40

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

07 ORA (ind lng) 7 T := *zDP; DPL += 1 50 44 0 0 30 40

vs DPH := *zDP; DPL += 1 10 44 0 0 30 40

6 TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A ORA B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0B PHD 4 *SP := 0; SP -= 1 FB 57 0 0 30 0

*SP := DH; SP -= 1 BB 57 0 0 34 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0C TSB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := A OR B 50 12 E8 0 10 0

Page 77: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

0F ORA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

11 ORA ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

12 ORA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

13 ORA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

14 TRB zpg 5 B := *zDP; ML C0 42 0 0 30 40

B := *zDP; T := !A AND B 50 42 48 0 30 40

*zDP := T F5 42 0 0 30 40

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

Page 78: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

15 ORA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

16 ASL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

17 ORA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A ORA B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

19 ORA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1A INC A 2 A := A + 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1B TCS imp 2 SP := A; IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1C TRB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := !A AND B 50 12 48 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1D ORA abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1E ASL abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

Page 79: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

6* B := *DP; ML C0 12 0 0 20 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

1F ORA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL; SP -= 1 F8 57 0 0 30 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

21 AND X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

22 JSR abs lng 7 *SP := PBR; SP -= 1 FB 57 0 0 31 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL SP -= 1 F9 57 0 0 30 0

DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

23 AND d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 30 40

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 30 40

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 80: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

27 AND zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2B PLD imp 5 SP += 1; B := *SP B0 56 0 0 0 0

DH := *SP; SP += 1 B0 56 0 0 30 4

B := *SP B0 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

2F AND abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 81: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

31 AND ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

32 AND (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

33 AND (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

34 BIT zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

35 AND zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

36 ROL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

37 AND(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

39 AND abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

Page 82: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3A DEC A 2 A := A - 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3B TSC imp 2 A := SP; SETF(NZ); IR := *PC; PC += 1; END A2 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3C BIT abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3D AND abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3E ROL abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

3F AND abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

40 RTI imp 7 SP += 1; B := *SP B0 56 0 0 0 0

vs P := *SP; SP += 1 70 56 0 0 30 0

6 PCL := *SP; SP += 1 80 56 0 0 30 0

PCH := *SP; SP += 1 90 56 0 0 30 0

PBR := *SP B0 52 0 0 30 1

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

41 EOR X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 83: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

42 WDM # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

43 EOR d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

44 MVPbnk,bn

k3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 30 40

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

47 EOR zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4B PHK imp 3 *SP := PBR; SP -= 1 FB 57 0 0 31 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 84: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

4F EOR abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

51 EOR ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

52 EOR (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

53 EOR (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 30 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

54 MVNbnk,bn

k3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

55 EOR zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

56 LSR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 30 40

Page 85: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

57 EOR(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

59 EOR abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5A PHY imp 3 *SP := Y; SP -= 1 F4 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5B TCD imp 3 A := 0 AB 2 8 0 0 0

vs 2 DH := BAR; SETF(NZ); IR := *PC; PC += 1; END BB 8 C 44 5 4

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5C JMP abs lng 4 DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5D EOR abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5E LSR abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 20 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

5F EOR abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 86: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 30 0

PCH := *SP 90 52 0 0 30 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

61 ADC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

62 PER PC rel 6 DPL := PCL + B + 1; B := *PC 8 2 C8 48 0 0

DPH := PCH + B; USE(IC); B := *PC; PC +=1 19 0 C8 58 0 0

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := DPL; SP -= 1 FA 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

63 ADC d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

64 STZ zpg 3 *zDP := 0 FB 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 30 40

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

67 ADC zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 40

B := *DPt B0 22 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 87: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6B RTL imp 7 SP += 1; B := *SP B0 56 0 0 0 0

vs PCL := *SP; SP += 1 80 56 0 0 30 0

6 PCH := *SP; SP += 1 90 56 0 0 30 0

PBR := *SP B0 52 0 0 30 1

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

6F ADC abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

71 ADC ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

72 ADC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

Page 88: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

73 ADC (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

74 STZ zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := 0 FB 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

75 ADC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

76 ROR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

77 ADC(ind

lng),Y7 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

79 ADC abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7A PLY imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 89: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

7B TDC imp 2 BAR := DH; SETF(NZ); IR := *PC; PC += 1; END BB 8 C 44 4 5

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7C JMP (abs,x) 6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7D ADC abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7E ROR abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 20 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

7F ADC abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

80 BRA rel 3* PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

81 STA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

82 BRL rel 4 DPL := PCL + B + 1; B := *PC 8 2 C8 48 0 0

DPH := PCH + B; USE(IC); B := *PC; PC +=1 19 0 C8 58 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

83 STA d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 *DP := A F0 12 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 90: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

87 STA zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

*DPt := A F0 22 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

89 BIT # 2 A AND B; SETF(Z); BIT; IR := *PC; PC += 1; END B0 8 8B 34 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8B PHB imp 3 *SP := DBR SP -= 1 BB 57 0 0 32 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

8F STA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 91: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

91 STA ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

92 STA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

93 STA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

94 STY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := Y F4 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

95 STA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := A F0 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

*zDP := X F3 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

97 STA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 92: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

99 STA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9B TXY imp 2 Y := X; SETF(NZ); IR := *PC; PC += 1; END 43 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9C STZ abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9D STA abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9E STZ abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

*DP := 0 FB 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

9F STA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A1 LDA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A3 LDA d,s 5 DPL := B + SP 2 2 C8 40 0 0

Page 93: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 30 40

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 30 40

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 30 40

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A7 LDA zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

A := *DPt F4 42 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AB PLB imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

DBR := B; SETF(NZ); IR := *PC; PC += 1; END B0 8 CC 4 0 2

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 94: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

AF LDA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 30 40

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B2 LDA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B3 LDA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B7 LDA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

Page 95: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

B9 LDA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BB TYX inp 2 X := Y; SETF(NZ); IR := *PC; PC += 1; END 34 8 C 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

BF LDA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C1 CMP X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 96: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C2 REP # 2 P := P AND !B; IR := *PC; PC += 1; END 77 8 28 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C3 CMP d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 30 40

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 30 40

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C7 CMP zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CB WAI imp 3 WAI; IR := *PC; PC += 1; END D0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 97: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

CF CMP abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 30 40

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D2 CMP (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D3 CMP (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D4 PEI imm 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := T; SP -= 1 F5 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

Page 98: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *zDP; ML C0 42 0 0 30 40

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D7 CMP(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DA PHX imp 3 *SP := X; SP -= 1 F3 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DB STP imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DC JMP(abs

lng)6 DPH := *PC; PC += 1 10 0 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP; ML C0 12 0 0 20 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 99: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DF CMP abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E1 SBC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E2 SEP # 2 P := P OR B; IR := *PC; PC += 1; END 77 8 E8 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E3 SBC d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 30 40

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 30 40

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E7 SBC zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

Page 100: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EB XBA imp 4 T := BAR 5C 2 8 40 5 0

BAR := A B0 2 8 40 0 5

A := T; IR := *PC; PC += 1; END A5 8 8 44 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

EF SBC abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F1 SBC ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F2 SBC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F3 SBC (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

Page 101: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F4 PEA imp 5 DPH := *PC; PC += 1 10 0 0 0 0 0

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := DPL; SP -= 1 FA 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F6 INC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F7 SBC(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FA PLX imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FC JSR (abs,x) 8 *SP := PCH; SP -= 1 F9 57 0 0 30 0

vs *SP := PCL; SP -= 1 F8 57 0 0 30 0

6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

Page 102: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

TBR := DBR + 0; USE(IC) BB 2 8 58 2 3

B := *DP; ML C0 12 0 0 20 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

FF SBC abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BB 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

01 ORA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

02 KIL imp 2 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

03 SLO X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

*DPt := DPL FA 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

04 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 103: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

06 ASL zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

07 SLO zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

0B ANC # 2 A := A AND B; SETF(NZC); IR := *PC; PC += 1; END.ARNC A0 8 8D 7 0 0

0C LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0F SLO abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

12 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

Page 104: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

13 SLO ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

*DPt := DPL FA 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

14 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

15 ORA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

16 ASL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

17 SLO zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

1B SLO abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1E ASL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

Page 105: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1F SLO abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

21 AND X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

22 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

23 RLA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

*DPt := DPL FA 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

26 ROL zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

27 RLA zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 106: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

2B ANC # 2 A := A AND B; SETF(NZC); IR := *PC; PC += 1; END.ARNC A0 8 8D 7 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

2F RLA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

32 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

33 RLA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

*DPt := DPL FA 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

34 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

35 AND zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

Page 107: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

36 ROL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

37 RLA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

3B RLA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3E ROL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3F RLA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

Page 108: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

PCH := *SP 90 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

41 EOR X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

42 CFG # 4 T := A 50 2 8 40 0 0

A := CFG AC 2 8 40 6 0

CFG := T; IR := *PC; PC += 1; END B5 8 8 44 0 6

43 SRE X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

*DPt := DPL FA 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

46 LSR zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

47 SRE zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

4B ALR # 2 A := A ALR B; SETF(NZC); IR := *PC; PC += 1; END A0 8 8D 24 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 109: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

4F SRE abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

52 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

53 SRE ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

*DPt := DPL FA 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

54 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

55 EOR zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

56 LSR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

57 SRE zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

Page 110: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

5B SRE abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5E LSR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5F SRE abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

61 ADC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

62 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

63 RRA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

Page 111: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

*DPt := DPL FA 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

64 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

66 ROR zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

67 RRA zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

6B ARR # 2 A := A AND B ROR; SETF(NZCV); IR := *PC; PC += 1; END.ARNCA0 8 8E 2F 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

PCL := *DP; DPL += 1 80 14 0 0 0 0

PCH := *DP 90 12 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6F RRA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

Page 112: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

72 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

73 RRA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

*DPt := DPL FA 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

74 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

75 ADC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

76 ROR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

77 RRA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

7B RRA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

Page 113: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7E ROR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7F RRA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

80 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

81 STA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

82 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

83 SAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A&X FE 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

87 SAX zpg 3 *zDP := A&X FE 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

89 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 114: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

8B XAA # 2 A := X AND B; SETF(NZ); IR := *PC; PC += 1; END A3 8 8C 4 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8F SAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A&X FE 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

92 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

93 AHX ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

*DPt := A&X AND DPH+1 EE 22 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

94 STY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

95 STA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

97 SAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := A&X FE 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 115: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

9B TAS abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A&X AND DPH+1 EE 12 80 0 10 0

SP := A&X; IR := *PC; PC += 1; END 2E 8 8 44 0 0

9C SHY abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := Y AND DPH+1 E4 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9E SHX abs,Y 05 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := X AND DPH+1 E3 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9F AHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A&X AND DPH+1 EE 12 80 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A1 LDA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A3 LAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

X := *DPt 30 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

Page 116: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A7 LAX zpg 3 X := *zDP 30 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

AB LXA # 3 X := B 30 2 C8 0 0 0

A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

AF LAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

B3 LAX ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Page 117: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

B7 LAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

X := *zDP 30 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

BB LAS abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

AXS := SP AND B; SETF(NZ); IR := *PC; PC += 1; END 62 8 8C 4 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

BF LAX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

X := *DP 30 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C1 CMP X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

C3 DCP X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

Page 118: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := B - 1; SETF(NZ) B 32 FC 80 0 0

*DPt := DPL FA 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C6 DEC zpg 5 B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C7 DCP zpg 5 B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

CB AXS imm 2 X := A&X SBC1 B; SETF(NZC); IR := *PC; PC += 1; END 3E 8 3D 4C 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

CF DCP abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

Page 119: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

D3 DCP ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := B - 1; SETF(NZ) B 32 FC 80 0 0

*DPt := DPL FA 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D7 DCP zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DB DCP abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

Page 120: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DF DCP abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E1 SBC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

E3 ISC X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := B + 1; SETF(NZ) 0 32 C 88 0 0

*DPt := DPL FA 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E6 INC zpg 5 B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E7 ISC zpg 5 B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

Page 121: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

EB SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

EF ISC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F2 KIL imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

F3 ISC ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := B + 1; SETF(NZ) 0 32 C 88 0 0

*DPt := DPL FA 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 122: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

F5 SBC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F6 INC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F7 ISC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

FB ISC abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FF ISC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

Page 123: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

01 ORA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

02 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

03 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

04 TSB zpg 5 B := *zDP; ML C0 42 0 0 10 0

B := *zDP; T := A OR B 50 42 E8 0 10 0

*zDP := T F5 42 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

07 RMB0 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

0B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

0C TSB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := A OR B 50 12 E8 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

Page 124: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0F BBR0 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

12 ORA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

13 NOP1 IR := *PC; PC += 1; END 0 8 0 4 0 0

14 TRB zpg 5 B := *zDP; ML C0 42 0 0 10 0

B := *zDP; T := !A AND B 50 42 48 0 10 0

*zDP := T F5 42 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

15 ORA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

16 ASL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

17 RMB1 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Page 125: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1A INC A 2 A := A + 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 C 4C 0 0

1B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

1C TRB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := !A AND B 50 12 48 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1E ASL abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1F BBR1 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

21 AND X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

22 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

23 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

Page 126: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

27 RMB2 zpg 5 B := *zDP; B0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

2B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

2F BBR2 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

32 AND (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

33 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 127: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

34 BIT zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

35 AND zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

36 ROL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

37 RMB3 zpg 5 B := *zDP; B0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3A DEC A 2 A := A - 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 FC 44 0 0

3B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

3C BIT abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3E ROL abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3F BBR3 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

Page 128: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

41 EOR X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

42 CFG # 4 T := A 50 2 8 40 0 0

A := CFG AC 2 8 40 6 0

CFG := T; IR := *PC; PC += 1; END B5 8 8 44 0 6

43 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

47 RMB4 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

4B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

4F BBR4 zp,rel 5* B := *zDP; B0 42 0 0 10 0

Page 129: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

52 EOR (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

53 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

54 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

55 EOR zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

56 LSR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

57 RMB5 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5A PHY imp 3 *SP := Y; SP -= 1 F4 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

5C LDD abs 8 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Page 130: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5E LSR abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5F BBR5 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

61 ADC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

62 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

63 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

64 STZ zpg 3 *zDP := 0 FB 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

67 RMB6 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 131: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

6B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

6C JMP (abs) 6 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6F BBR6 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

72 ADC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

73 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

74 STZ zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := 0 FB 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 132: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

75 ADC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

76 ROR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

77 RMB7 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := BCG AND B; 5F 2 88 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7A PLY imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

7B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

7C JMP (abs,x) 6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7E ROR abs,X 6* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7F BBR7 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := !B; B := *PC; PC += 1; EXIT.BTF 50 0 38 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

80 BRA rel 3* PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 133: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

81 STA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

82 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

83 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

87 SMB0 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

89 BIT # 2 A AND B; SETF(Z); BIT; IR := *PC; PC += 1; END B0 8 8B 34 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

8B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8F BBS0 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 134: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

92 STA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

93 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

94 STY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

95 STA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

97 SMB1 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

9B NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

9C STZ abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9E STZ abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *PBA 10 32 C8 18 0 0

Page 135: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9F BBS1 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A1 LDA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A7 SMB2 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

AB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Page 136: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

AF BBS2 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B2 LDA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

B7 SMB3 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

BB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Page 137: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

BF BBS3 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C1 CMP X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C2 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

C3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C7 SMB4 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

CB WAI imp 3 WAI; IR := PC; PC += 1; END D0 8 0 4 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

Page 138: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

CF BBS4 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D2 CMP (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

D4 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D7 SMB5 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 139: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DA PHX imp 3 *SP := X; SP -= 1 F3 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DB STP imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DC LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DF BBS5 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E1 SBC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E2 LDD # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

E3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

Page 140: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E7 SMB6 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

EB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

EF BBS6 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F2 SBC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F3 NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

Page 141: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F6 INC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F7 SMB7 zpg 5 B := *zDP; ML C0 42 0 0 10 0

T := !BCG OR B; 5F 2 D8 0 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FA PLX imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

FB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

FC LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FF BBS7 zp,rel 5* B := *zDP; B0 42 0 0 10 0

T := B; B := *PC; PC += 1; EXIT.BTF 50 0 C8 3 0 0

PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 90 32 C8 18 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

00 BRK “Sig" 7 *SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

Page 142: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 10 10

PCL := *fCP; DPL += 1 80 74 0 0 0 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 0 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

01 ORA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

02 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

03 SLO X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

04 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

06 ASL zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

07 SLO zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

0B ANC # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

0C LDD abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

Page 143: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0F SLO abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

11 ORA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

12 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

13 SLO ind,Y B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ASL B; SETF(NZC) B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

14 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

15 ORA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

16 ASL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

17 SLO zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 144: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

19 ORA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

1B SLO abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1D ORA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1E ASL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1F SLO abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 10 0

*SP := PCL; SP -= 1 F8 57 0 0 10 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

21 AND X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

22 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

23 RLA X,ind DPL := B + X; B := *zDP 3 42 C8 40 0 0

Page 145: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

26 ROL zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

27 RLA zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

2B ANC # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

2F RLA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 146: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

31 AND ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

32 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

33 RLA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROL B; SETF(NZC) B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

34 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

35 AND zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

36 ROL zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

37 RLA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

39 AND abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

3B RLA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

Page 147: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

3C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3D AND abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3E ROL abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3F RLA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

40 RTI imp 6 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP; SP += 1 70 56 0 0 10 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

41 EOR X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

42 CFG # 4 T := A 50 2 8 40 0 0

A := CFG AC 2 8 40 6 0

CFG := T; IR := *PC; PC += 1; END B5 8 8 44 0 6

43 SRE X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

44 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 148: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

46 LSR zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

47 SRE zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

4B ALR # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

4F SRE abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

51 EOR ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

52 KIL imp 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

53 SRE ind,Y B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

Page 149: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 LSR B; SETF(NZC) B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

54 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

55 EOR zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

56 LSR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

57 SRE zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

59 EOR abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

5B SRE abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5D EOR abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5E LSR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

Page 150: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5F SRE abs,X 7 PC -= 1 0 33 0 0 0 0

DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 10 0

PCH := *SP 90 52 0 0 10 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

61 ADC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

62 KIL imp 6 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

63 RRA X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

64 LDD zpg 3 B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

66 ROR zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

67 RRA zpg 5 B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 151: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

6B ARR # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

PCL := *DP; DPL += 1 80 14 0 0 0 0

PCH := *DP 90 12 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6F RRA abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

71 ADC ind,y 5 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

72 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

73 RRA ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

DPL := 0 ROR B; SETF(NZC) B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

74 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

75 ADC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Page 152: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

76 ROR zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

77 RRA zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

79 ADC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7A NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

7B RRA abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7C LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7D ADC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7E ROR abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7F RRA abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

80 LDD imm 02 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 153: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

81 STA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

82 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

83 SAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

87 SAX zpg 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

89 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

8B XAA # 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8F SAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 154: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

91 STA ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP 4 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

92 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

93 AHX ind,Y 6 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

94 STY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := Y F4 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

95 STA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

*zDP := A F0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

*zDP := X F3 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

97 SAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

99 STA abs,Y 5 DPL := B + Y; B := *PC; PC += 1 4 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

9B TAS abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9C SHY abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC) 10 32 C8 18 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9D STA abs,X 5 DPL := B + X; B := *PC; PC += 1 3 0 C8 40 0 0

DPH := B + 0; USE(IC); B := *DP 10 12 C8 18 0 0

*DP := A F0 12 0 0 10 0

Page 155: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

IR := *PC; PC += 1; END 0 8 0 4 0 0

9E SHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9F AHX abs,Y 5 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A1 LDA X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A3 LAX X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A4 LDY zpg 3 B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A7 LAX zpg 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

AB LXA # 3 NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

Page 156: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

AF LAX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B1 LDA ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B2 KIL imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

B3 LAX ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

B7 LAX zpg,Y 4 DPL := B + Y; B := *zDP 4 42 C8 40 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

B9 LDA abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

BB LAS abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

Page 157: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

BD LDA abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

BF LAX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C1 CMP X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

C3 DCP X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C6 DEC zpg 5 B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

C7 DCP zpg 5 B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 158: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

CB AXS imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

CF DCP abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D2 KIL imp 3 IR := *PC; PC += 1; END 0 8 0 4 0 0

D3 DCP ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

Page 159: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D7 DCP zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

DB DCP abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DD CMP abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DF DCP abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

Page 160: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

E1 SBC X,ind 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E2 LDD imm 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

E3 ISC X,ind 8 DPL := B + X; B := *zDP 3 42 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 10 0

DPH := *zDP 10 42 0 0 10 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E6 INC zpg 5 B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E7 ISC zpg 5 B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

EB SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 161: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

EF ISC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F1 SBC ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 10 0

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 10 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F2 KIL imp 3 IR := *PC; PC += 1; END 0 8 0 4 0 0

F3 ISC ind,Y 8 B := *zDP; DPL += 1 B0 44 0 0 10 0

T := B + Y; DPH.db := *zDP 54 C2 C8 40 10 0

DPH := DPH + 0; USE(IC); B := *DPt 11 22 8 58 0 0

B := *DPt B0 22 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F4 LDD zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F6 INC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F7 ISC zpg,X 6 DPL := B + X; B := *zDP 3 42 C8 40 0 0

B := *zDP B0 42 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 162: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

FB ISC abs,Y 7 DPL := B + Y; DPH.db := *PC; PC += 1 4 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FC LDD abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FF ISC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *DP 11 12 8 58 0 0

B := *DP B0 12 0 0 10 0

NOP B0 32 0 0 0 0

NOP B0 32 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

00 BRK “Sig" 9 *SP := PBR; SP -= 1 FC 57 0 0 31 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL; SP -= 1 F8 57 0 0 30 0

*SP := P; SP -= 1; PBR.CLR F7 57 0 0 30 10

PBR := 0 BB 2 8 0 0 1

PCL := *fCP; DPL += 1 80 74 0 0 30 0

PCH := *fDP; SETF(SEI/CLD) 90 62 2 0 30 0

IR := *PC; PC += 1; END.INT 0 8 0 6 0 0

01 ORA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

02 SPI # 10 SPI (ALU PASS B) B6 2 C0 0 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

A := A ROL 0 A0 2 A8 50 0 0

Page 163: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A ROL 0; IR := *PC; PC += 1; END A0 8 A8 54 0 0

03 ORA d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

04 TSB zpg 5 B := *zDP; ML C0 42 0 0 30 40

B := *zDP; T := A OR B 50 42 E8 0 30 40

*zDP := T F5 42 0 0 30 40

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

05 ORA zpg 3 B := *zDP B0 42 0 0 30 40

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

06 ASL zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

07 ORA (ind lng) 7 T := *zDP; DPL += 1 50 44 0 0 30 40

vs DPH := *zDP; DPL += 1 10 44 0 0 30 40

6 TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A ORA B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

08 PHP imp 3 *SP := P; SP -= 1 F7 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

09 ORA # 2 A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0A ASL A 2 A := A ASL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 44 0 0

0B PHD 4 *SP := 0; SP -= 1 FB 57 0 0 30 0

*SP := DH; SP -= 1 FC 57 0 0 34 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

0C TSB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := A OR B 50 12 E8 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

0D ORA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

0E ASL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 164: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

0F ORA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

10 BPL rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

11 ORA ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

12 ORA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

13 ORA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

14 TRB zpg 5 B := *zDP; ML C0 42 0 0 30 40

B := *zDP; T := !A AND B 50 42 48 0 30 40

*zDP := T F5 42 0 0 30 40

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

15 ORA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

16 ASL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

17 ORA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A ORA B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

18 CLC imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

Page 165: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

19 ORA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1A INC A 2 A := A + 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 C 4C 0 0

1B TCS imp 2 SP := A; IR := *PC; PC += 1; END B0 8 F9 4 0 0

1C TRB abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

B := *DP; T := !A AND B 50 12 48 0 10 0

*DP := T F5 12 0 0 10 0

A AND B; SETF(Z); IR := *PC; PC += 1; END B0 8 8B 4 0 0

1D ORA abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

1E ASL abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 20 0

T := 0 ASL B; SETF(NZC) 5B 32 CD 80 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

1F ORA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A OR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 EC 4 0 0

20 JSR abs 6 B := *SP B0 52 0 0 10 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL; SP -= 1 F8 57 0 0 30 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

21 AND X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

22 JSR abs lng 7 *SP := PBR; SP -= 1 FC 57 0 0 31 0

*SP := PCH; SP -= 1 F9 57 0 0 30 0

*SP := PCL SP -= 1 F9 57 0 0 30 0

DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

23 AND d,s 5 DPL := B + SP 2 2 C8 40 0 0

Page 166: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

24 BIT zpg 3 B := *zDP B0 42 0 0 30 40

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

25 AND zpg 3 B := *zDP B0 42 0 0 30 40

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

26 ROL zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

27 AND zpgLng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

28 PLP imp 4 SP += 1; B := *SP B0 56 0 0 0 0

P := *SP 70 52 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

29 AND # 2 A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2A ROL A 2 A := A ROL 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 54 0 0

2B PLD imp 5 SP += 1; B := *SP B0 56 0 0 0 0

DH := *SP; SP += 1 B0 56 0 0 30 4

B := *SP B0 52 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

2C BIT abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

2D AND abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

2E ROL abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

2F AND abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

Page 167: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

30 BMI rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

31 AND ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

32 AND (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

33 AND (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

34 BIT zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

35 AND zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

36 ROL zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

37 AND(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

38 SEC imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

39 AND abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3A DEC A 2 A := A - 1; SETF(NZ); IR := *PC; PC += 1; END A0 8 FC 44 0 0

Page 168: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

3B TSC imp 2 A := SP; SETF(NZ); IR := *PC; PC += 1; END A2 8 C 44 0 0

3C BIT abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A AND B; SETF(NZV); BIT; IR := *PC; PC += 1; END B0 8 8F 34 0 0

3D AND abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

3E ROL abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 20 0

T := 0 ROL B; SETF(NZC) 5B 32 CD 90 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

3F AND abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A AND B; SETF(NZ); IR := *PC; PC += 1; END A0 8 8C 4 0 0

40 RTI imp 7 SP += 1; B := *SP B0 56 0 0 0 0

vs P := *SP; SP += 1 70 56 0 0 30 0

6 PCL := *SP; SP += 1 80 56 0 0 30 0

PCH := *SP; SP += 1 90 56 0 0 30 0

PBR := *SP B0 52 0 0 30 1

IR := *PC; PC += 1; END 0 8 0 4 0 0

41 EOR X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

42 CFG # 4 T := A 50 2 8 40 0 0

A := CFG AC 2 8 40 6 0

CFG := T; IR := *PC; PC += 1; END B5 8 8 44 0 6

43 EOR d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

44 MVPbnk,bn

k3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

45 EOR zpg 3 B := *zDP B0 42 0 0 30 40

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

Page 169: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

46 LSR zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

47 EOR zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

48 PHA imp 3 *SP := A; SP -= 1 F0 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

49 EOR # 2 A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4A LSR A 2 A := A LSR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 24 0 0

4B PHK imp 3 *SP := PBR; SP -= 1 FC 57 0 0 31 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

4C JMP abs 3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

4D EOR abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

4E LSR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

4F EOR abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

50 BVC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

51 EOR ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

52 EOR (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

Page 170: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

53 EOR (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 30 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

54 MVNbnk,bn

k3 DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

55 EOR zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

56 LSR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

57 EOR(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

58 CLI imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

59 EOR abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 10 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5A PHY imp 3 *SP := Y; SP -= 1 F4 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5B TCD imp 2 DH := BAR; SETF(NZ); IR := *PC; PC += 1; END BC 8 C 44 5 4

5C JMP abs lng 4 DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

5D EOR abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

5E LSR abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

Page 171: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

6* B := *DP; ML C0 12 0 0 20 0

T := 0 LSR B; SETF(NZC) 5B 32 CD 20 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

5F EOR abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A EOR B; SETF(NZ); IR := *PC; PC += 1; END A0 8 6C 4 0 0

60 RTS imp 6 SP += 1; B := *SP B0 56 0 0 0 0

PCL := *SP; SP += 1 80 56 0 0 30 0

PCH := *SP 90 52 0 0 30 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

61 ADC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

62 PER PC rel 6 DPL := PCL + B + 1; B := *PC 8 2 C8 48 0 0

DPH := PCH + B; USE(IC); B := *PC; PC +=1 19 0 C8 58 0 0

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := DPL; SP -= 1 FA 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

63 ADC d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

64 STZ zpg 3 *zDP := 0 FB 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

65 ADC zpg 3 B := *zDP B0 42 0 0 30 40

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

66 ROR zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

67 ADC zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 40

B := *DPt B0 22 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

68 PLA imp 4 SP += 1; B := *SP B0 56 0 0 0 0

Page 172: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *SP B0 52 0 0 30 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

69 ADC # 2 A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6A ROR A 2 A := A ROR 0; SETF(NZC); IR := *PC; PC += 1; END A0 8 AD 2C 0 0

6B RTL imp 7 SP += 1; B := *SP B0 56 0 0 0 0

vs PCL := *SP; SP += 1 80 56 0 0 30 0

6 PCH := *SP; SP += 1 90 56 0 0 30 0

PBR := *SP B0 52 0 0 30 1

DPL := B := *PC; PC += 1 0 0 0 0 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6C JMP (abs) 5 DPH := *PC; PC += 1 10 0 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

6D ADC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

6E ROR abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

6F ADC abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

70 BVS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

71 ADC ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

72 ADC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

73 ADC (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

Page 173: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

74 STZ zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := 0 FB 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

75 ADC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

76 ROR zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

77 ADC(ind

lng),Y7 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

78 SEI imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

79 ADC abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7A PLY imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

7B TDC imp 3 A := 0 AB 2 8 0 0 0

vs 2 BAR := DH; SETF(NZ); IR := *PC; PC += 1; END BC 8 C 44 4 5

7C JMP (abs,x) 6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

7D ADC abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

7E ROR abs,X 7* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

Page 174: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

6* B := *DP; ML C0 12 0 0 20 0

T := 0 ROR B; SETF(NZC) 5B 32 CD 28 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

7F ADC abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A ADC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 CE 55 0 0

80 BRA rel 3* PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

81 STA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

82 BRL rel 4 DPL := PCL + B + 1; B := *PC 8 2 C8 48 0 0

DPH := PCH + B; USE(IC); B := *PC; PC +=1 19 0 C8 58 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

83 STA d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 *DP := A F0 12 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

84 STY zpg 3 *zDP := Y F4 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

85 STA zpg 3 *zDP := A F0 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

86 STX zpg 3 *zDP := X F3 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

87 STA zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

*DPt := A F0 22 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

88 DEY imp 2 Y := Y - 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 FC 44 0 0

89 BIT # 2 A AND B; SETF(Z); BIT; IR := *PC; PC += 1; END B0 8 8B 34 0 0

8A TXA imp 2 A := X; SETF(NZ); IR := *PC; PC += 1; END A3 8 C 44 0 0

8B PHB imp 3 *SP := DBR SP -= 1 FC 57 0 0 32 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 175: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

8C STY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := Y F4 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8D STA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := A F0 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8E STX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := X F3 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

8F STA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

90 BCC rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

91 STA ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

92 STA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*DPt := A F0 22 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

93 STA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

94 STY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := Y F4 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

95 STA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

*zDP := A F0 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

96 STX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

*zDP := X F3 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

Page 176: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

97 STA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

98 TYA imp 2 A := Y; SETF(NZ); IR := *PC; PC += 1; END A4 8 C 44 0 0

99 STA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9A TXS imp 2 SP := X; IR := *PC; PC += 1; END 23 8 8 44 0 0

9B TXY imp 2 Y := X; SETF(NZ); IR := *PC; PC += 1; END 43 8 C 44 0 0

9C STZ abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

*DP := 0 FB 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9D STA abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9E STZ abs,X 5 DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

*DP := 0 FB 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

9F STA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

*DP := A F0 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A0 LDY # 2 Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A1 LDA X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A2 LDX # 2 X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A3 LDA d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 177: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

A4 LDY zpg 3 B := *zDP B0 42 0 0 30 40

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

A5 LDA zpg 3 B := *zDP B0 42 0 0 30 40

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

A6 LDX zpg 3 B := *zDP B0 42 0 0 30 40

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

A7 LDA zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

A := *DPt F4 42 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

A8 TAY imp 2 Y := A; SETF(NZ); IR := *PC; PC += 1; END 40 8 C 44 0 0

A9 LDA # 2 A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AA TAX imp 2 X := A; SETF(NZ); IR := *PC; PC += 1; END 30 42 0 0 10 0

AB PLB imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

DBR := B; SETF(NZ); IR := *PC; PC += 1; END B0 8 CC 4 0 2

AC LDY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

AD LDA abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

AE LDX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

AF LDA abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B0 BCS rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

B1 LDA ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 178: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B2 LDA (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B3 LDA (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B4 LDY zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

B5 LDA zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B6 LDX zpg,Y 4 DPL := B + Y; B := *PBA 4 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

B7 LDA(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

B8 CLV imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

B9 LDA abs,Y 5* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

BA TSX imp 2 X := SP; SETF(NZ); IR := *PC; PC += 1; END 32 8 C 44 0 0

BB TYX inp 2 X := Y; SETF(NZ); IR := *PC; PC += 1; END 34 8 C 44 0 0

BC LDY abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

Y := B; SETF(NZ); IR := *PC; PC += 1; END 40 8 CC 4 0 0

BD LDA abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

Page 179: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

BE LDX abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

BF LDA abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := B; SETF(NZ); IR := *PC; PC += 1; END A0 8 CC 4 0 0

C0 CPY # 2 Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C1 CMP X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C2 REP # 2 P := P AND !B; IR := *PC; PC += 1; END 77 8 28 4 0 0

C3 CMP d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C4 CPY zpg 3 B := *zDP B0 42 0 0 30 40

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

C5 CMP zpg 3 B := *zDP B0 42 0 0 30 40

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C6 DEC zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

C7 CMP zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

C8 INY imp 2 Y := Y + 1; SETF(NZ); IR := *PC; PC += 1; END 44 8 C 4C 0 0

C9 CMP # 2 A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CA DEX imp 2 X := X - 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 FC 44 0 0

CB WAI imp 3 WAI; IR := *PC; PC += 1; END D0 8 0 4 0 0

CC CPY abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

Page 180: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

B := *DP B0 12 0 0 10 0

Y CMP B; SETF(NZC); IR := *PC; PC += 1; END B4 8 3D 4C 0 0

CD CMP abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

CE DEC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

CF CMP abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D0 BNE rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D1 CMP ind,Y 5* B := *zDP; DPL += 1 B0 44 0 0 30 40

DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D2 CMP (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D3 CMP (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D4 PEI imm 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := T; SP -= 1 F5 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

D5 CMP zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D6 DEC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

Page 181: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

D7 CMP(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

D8 CLD imp 2 SETF(OPCODE 0); IR := *PC; PC += 1; END B0 8 9 4 0 0

D9 CMP abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DA PHX imp 3 *SP := X; SP -= 1 F3 57 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DB STP imp 3 STP; IR := *PC; PC += 1; END BD 8 0 4 0 0

DC JMP(abs

lng)6 DPH := *PC; PC += 1 10 0 0 0 0 0

DPL := *DP; PC += 1 0 10 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

PBR := *PC; PC += 1 B0 0 0 0 0 1

IR := *DP; PC += 1; END B0 18 0 4 0 0

DD CMP abs,X 5* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

vs TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

4* B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

DE DEC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP; ML C0 12 0 0 20 0

T := B - 1; SETF(NZ) 50 32 FC 80 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

DF CMP abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A CMP B; SETF(NZC); IR := *PC; PC += 1; END B0 8 3D 4C 0 0

E0 CPX # 2 X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E1 SBC X,ind 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

T := *zDP; DPL += 1 50 44 0 0 30 40

Page 182: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E2 SEP # 2 P := P OR B; IR := *PC; PC += 1; END 77 8 E8 4 0 0

E3 SBC d,s 5 DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

4 B := *DP B0 12 0 0 30 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E4 CPX zpg 3 B := *zDP B0 42 0 0 30 40

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

E5 SBC zpg 3 B := *zDP B0 42 0 0 30 40

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E6 INC zpg 5 B := *zDP; ML C0 42 0 0 30 40

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

E7 SBC zpg lng 6 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP; DPL += 1 10 44 0 0 30 40

TBR := *zDP B0 42 0 0 30 43

B := *DPt B0 22 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

E8 INX imp 2 X := X + 1; SETF(NZ); IR := *PC; PC += 1; END 33 8 C 4C 0 0

E9 SBC # 2 A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EA NOP imp 2 IR := *PC; PC += 1; END 0 8 0 4 0 0

EB XBA imp 4 T := BAR 5C 2 8 40 5 0

BAR := A B0 2 8 40 0 5

A := T; IR := *PC; PC += 1; END A5 8 8 44 0 0

EC CPX abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

X CMP B; SETF(NZC); IR := *PC; PC += 1; END B3 8 3D 4C 0 0

ED SBC abs 4 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP B0 12 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

EE INC abs 6 DPH := *PC; PC += 1 10 0 0 0 0 0

B := *DP; ML C0 12 0 0 10 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 10 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

EF SBC abs lng 5 DPH := *PC; PC += 1 10 0 0 0 0 0

Page 183: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

TBR := *PC; PC += 1 B0 0 0 0 0 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F0 BEQ rel 2** PCL := PCL + B; EXIT.CC 88 2 C8 41 0 0

PCH = PCH + signextend(*); USE(IC) 99 2 C8 78 0 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F1 SBC ind,Y 6* B := *zDP; DPL += 1 B0 44 0 0 30 40

vs DPL := B + Y; DPH.db := *zDP; INCDPH.C 4 C2 C8 42 30 40

5* TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F2 SBC (zpg) 5 T := *zDP; DPL += 1 50 44 0 0 30 40

DPH := *zDP 10 42 0 0 30 40

B := *DPt B0 22 0 0 10 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F3 SBC (d,s),Y 8* DPL := B + SP 2 2 C8 40 0 0

vs DPH := 1 10 2 8 8 0 0

7* B := *DP; DPL += 1 B0 14 0 0 30 0

DPL := B + Y; DPH.db := *DP; INCDPH.C 4 92 C8 42 30 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F4 PEA imp 5 DPH := *PC; PC += 1 10 0 0 0 0 0

*SP := DPH; SP -= 1 F1 57 0 0 30 0

*SP := DPL; SP -= 1 FA 57 0 0 30 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

F5 SBC zpg,X 4 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP B0 42 0 0 30 40

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F6 INC zpg,X 6 DPL := B + X; B := *PBA 3 32 C8 40 0 0

B := *zDP; ML C0 42 0 0 30 40

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*zDP := T F5 42 0 0 30 40

IR := *PC; PC += 1; END 0 8 0 4 0 0

F7 SBC(ind

lng),Y8 B := *zDP; DPL += 1 B0 44 0 0 30 40

vs T := B + Y; DPH.db := *zDP; DPL +=1 54 C4 C8 40 30 40

6 DPH := DPH + 0; USE(IC); TBR.db := *zDP 11 42 8 58 30 63

TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

DPL := T 5 2 8 40 0 0

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

F8 SED imp 2 SETF(OPCODE 1); IR := *PC; PC += 1; END B0 8 F9 4 0 0

F9 SBC abs,Y 4* DPL := B + Y; DPH.db := *PC; PC += 1; INCDPH.C 4 80 C8 42 0 0

Page 184: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FA PLX imp 4 SP += 1; B := *SP B0 56 0 0 0 0

B := *SP B0 52 0 0 30 0

X := B; SETF(NZ); IR := *PC; PC += 1; END 30 8 CC 4 0 0

FB NOP1 1 IR := *PC; PC += 1; END 0 8 0 4 0 0

FC JSR (abs,x) 8 *SP := PCH; SP -= 1 F9 57 0 0 30 0

vs *SP := PCL; SP -= 1 F8 57 0 0 30 0

6 PCL := B + X; B := *PC 83 2 C8 40 0 0

PCH := B + 0; USE(IC) 90 32 C8 18 0 0

DPL := B := *PC; PC += 1 0 0 0 0 0 0

DPH := *PC; PC += 1 10 0 0 0 0 0

IR := *DP; PC += 1; END B0 18 0 4 0 0

FD SBC abs,X 4* DPL := B + X; DPH.db := *PC; PC += 1; INCDPH.C 3 80 C8 42 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

FE INC abs,X 7 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

DPH := DPH + 0; USE(IC); B := *PBA 11 32 8 58 0 0

TBR := DBR + 0; USE(IC) BC 2 8 58 2 3

B := *DP; ML C0 12 0 0 20 0

T := B + 1; SETF(NZ) 50 32 C 88 0 0

*DP := T F5 12 0 0 20 0

IR := *PC; PC += 1; END 0 8 0 4 0 0

FF SBC abs lng,X 6 DPL := B + X; DPH.db := *PC; PC += 1 3 80 C8 40 0 0

vs DPH := DPH + 0; USE(IC); TBR.db := *PC; PC +=1 11 0 8 58 0 23

5* TBR := TBR + 0; USE(IC) BC 2 8 58 3 3

B := *DP B0 12 0 0 20 0

A := A SBC B; SETF(NZCV); IR := *PC; PC += 1; END.D A0 8 3E 55 0 0

Page 185: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C74-6502 Compatibility Testing

CPU Machine/Software Status CPU Machine/Software Status

WDC 65C02 C74-SBC (Project Test Machine) NMOS 6510 Commodore C64 -- FPGA64 Tests

C74-Minimon (test monitor program) Passed (http://www.syntiac.com/fpga64.htmll)

Klauss Dorman 65C02 Test Suite Passed Ace 2 Passed

Bruce Clark CMOS Decimal Mode Partial1 Barbarian Passed

STP/WAI Specific Tests Passed Barbarian + Passed

21MHz Speed Test Passed Barbarian I Passed

1Decimal Mode invalid BCD inputs generate NMOS results Barbarian II Passed

Barbarian II+M Trainer Passed

WDC 65C02 Looking for test candidates … TBD Bluemax Passed

Delta Passed

NMOS 6502 C74-SBC (project test machine) Elidon Passed

Klaus Dormann 6502 Test Suite Passed Exploding Fist 2 Need a copy

Bruce Clarke NMOS Decimal Mode Passed Gianna Sisters Need a copy

Undocumented Opcodes Tests Passed Gianna Sisters Intro Need a copy

IK+ Passed

NMOS 6502 Commodore PET Systems Impossible Misssion Passed

Looking for test candidates … TBD Karateka Passed

KillerWatt Passed

NMOS 6502 Commodore VIC-20 -- Basics Paradroid Passed

Boot Screen Passed R-Type Passed

Commodore Basic Floating Point Passed Rags To Riches Passed

NMOS 6502 Commodore VIC-20 -- "Top 10" & Other NMOS 6510 Commodore C64 -- "Best of"

https://www.retrogamer.net/top_10/top-ten-commodore-vic-20-games/ https://youtu.be/ZLHhyI35Dgw

Jelly Monsters TBD 1983 Lode Runner (Broderbund) Passed

Omega Race TBD 1984 Boulder Dash (First Star) Passed

Matrix TBD 1985 Elite (Firebird) Passed

Sword of Fargoal TBD 1986 Ghost 'n Goblins (Capcom/Elite) Passed

Demon Attack TBD 1986 Legend of Kage (Taito) Passed

Key Quest TBD 1986 Paperboy (Atari/Elite) Passed

Laser Zone TBD 1987 International Karate+ a.ka. IK+ Passed

Astro Nell TBD 1987 Pirates! (MicroProse) Passed

Avenger TBD 1987 Defender of the Crown Need a copy

Gorf TBD 1987 Last Ninja (System 3 Software) Passed

Choplifter Passed 1987 Maniac Mansion (LucasArts) Passed

Pole Position TBD 1987 Barbarian (Psygnosis) Passed

Donkey Kong TBD 1987 California Games (Epyx) Passed

Frogger Passed 1987 Bubble Bobble (Taito/Firebird) Passed

Jungle Hunt TBD 1988 Wasteland (Interplay) Need a copy

Sargon 2 TBD 1988 Last Ninja 2 Passed

Blitz TBD 1988 Zak McKracken Need a copy

Vic Rat race TBD 1989 Battle Chess (Interplay) Need a copy

Alphabet Zoo TBD 1990 Turrican (Rainbow Arts) Need a copy

Wacky Waiters TBD 1991 Turrican 2: The Final Fight Need a copy

Shamus TBD

Lode Runner TBD NMOS 6510 Commodore C64 -- "30 Best"

Q*Bert TBD https://youtu.be/MUsAW7b8vMQ

Frogger TBD 30. Raid Over Moscow + 3 Need a copy

Jetpac TBD 29. Seaside Special Need a copy

Galaxian TBD 28. Archon Passed

Ultima TBD 27. Robocop Passed

Grid Runner TBD 26. R-TYPE Passed

Ms. Pac Man TBD 25. Rambo Passed

24. Ballblazer Passed

NMOS 6502 Apple II 23. Last Ninja Passed

Looking for test candidates … TBD 22. Bounder Passed

21. Chuckie Egg Passed

NMOS 6510 Commodore 64 -- Basics 20. Cauldron II Passed

Boot Screen Passed 19. Dizzy Passed

Commodore Basic Floating Point Passed 18. Ghostbusters Passed

17. Impossible Mission Passed

Commodore C64 -- Classics & Others 16. Kikstart 2 Passed

Defender Passed 15. Turrican Need a copy

Pac-Man Passed 14. Commando Passed

Pole Position Passed 13. California Games Passed

Space Invaders Passed 12. Pitstop II Need a copy

Galaga Passed 11. Pyjamarama Need a copy

Pit Stop 2 Passed 10. Bombjack Passed

Rambo Passed 9. Leaderboard Passed

Last Ninja II Passed 8. Rainbow Islands Need a copy

Ghostbusters Passed 7. IK+ Passed

Kickstart Passed 6. Thrust Passed

Commando Passed 5. Paradroid Passed

Neoclyps Passed 4. Uridium Passed

Metroblitz Passed 3. Stunt Car Racer Passed

Moby Dick Passed 2. Gauntlet Passed

Way Of The Exploding Fist Passed 1. Elite Passed

Winter Games Passed

Space Taxi Passed

Defender of the Crown

Ultima V

Laser Squad

Exile

Last Updated 11/27/2018

http://www.syntiac.com/fpga64.html
https://www.retrogamer.net/top_10/top-ten-commodore-vic-20-games/
https://youtu.be/ZLHhyI35Dgw
https://youtu.be/MUsAW7b8vMQ
Page 186: C74 - 6502 Microcode · 16 asl zpg,x 6 dpl := b + x; b := *zdp 3 42 c8 40 0 0 b := *zdp; ml c0 42 010 t := 0 asl b; setf(nzc) 5b 32 cd 80 0 *zdp := t f5 42 010 ir := *pc; pc += 1;

C74-6502 Compatibility Testing

Bruce Lee

Project Stealth Fighter

Ultima III

M.U.L/.EProject FirestartMicroProse Soccer

Summer Games

Airborne Ranger

Katakis

World Class Leader board

Creatures 2

H.E.R.O

Jumpman

Way of the exploding fist, The

Wizard of Wor

Lode Runner

Demos

We Are In Nothing

Vicious SID Npothing

Unsound minds Test w/

6510

Need to see it on 6510. Screen blanks after a while but looks ok.

Transform Focus Blue and Purple screens

The Wild Bunch Test pattern on screen?

Snapshot Nothing

Sharp Hangs w/ flicker screen

Noice Pseudocode Passed

Pearls

1000 miles from earth

Natural Wonders Screen blanks …

Meka … Instinct & Booze flash flash oyut to basic?

Mathem Please turn disc …

Insomnia C64 Forever Cannot run on NTSC machines

Error23 Flashing screen then blank loading?

Empirion music -- disk drive should be cycle exact

Edge of disgrace

Dutch Breeze Hangs after credits with music playing

Deus Ex Machina Blue Screen

Das Gotler Blue Screen

Cauldron Failed. Runs and the hangs -- suspect missing NMI … USES LAX UFO.

Boggie Factor

Andropolis Flash then hang

Last Updated 11/27/2018


BiSL/ ASL, het wondermiddel voor de IT beheerperikelen ... · BiSL/ ASL, het wondermiddel voor de IT beheerperikelen binnen de Nederlandse gezondheidszorg? 1 1 Aanleiding tot het

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BSF Sm-17-1...Quelle: Barozzi / Veiga GmbH, Chur Kunstmuseum BSF Sm-17-1 MusØe d’art Museo Plangrösse 42/30cm Format 42/30cm Formato 42/30cm 0 5 10 20 35m N Verwaltungsgebäude

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Toma Cycles Cup Klassement 2019-2020 - RENNERZ · Daan Maessen 0 1 43 43 37. Roderick Vaasen 0 1 43 43 38. Anna Maria Borger 0 1 42 42 39. Lars Dohmen 0 1 41 41 40. Scott Sijen 0

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ASL GA11-30C-MK IV.pdf

ASL GA11-30C-MK IV.pdf

Presentatie onthaalmoment 20142015 versie 06082014 · 2014. 10. 7. · Watersportlaan 5 – 9000 Gent T +32 (0)9 224 71 11 – F +32 (0)9 224 70 42 info@janpalfijngent.be – Veel

Presentatie onthaalmoment 20142015 versie 06082014 · 2014. 10. 7. · Watersportlaan 5 – 9000 Gent T +32 (0)9 224 71 11 – F +32 (0)9 224 70 42 [email protected] – Veel

Uitwerkingen ASL

Uitwerkingen ASL

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Panasonic · 0000-00000000-0 .=oooo-oooooooo-n . Created Date: 4/12/2019 10:27:42 AM

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