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Zufolek on 11/01/09

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Last Edited at 11/01/09 01:12am

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6502 Instruction Set

/ Published in: C

May contain mistakes.

Suffix:
ac=accumulator
im=immediate
zp=zero page
zx=zero page,x
ab=absolute
ax=absolute,x
ay=absolute,y
ix=indirect,x
iy=indirect,y

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enum{
 BRK_,//0
 ORA_IX,
 JAM_,
 SLO_IX,
 NOP_ZP,
 ORA_ZP,
 ASL_ZP,
 SLO_ZP,
 PHP_,
 ORA_IM,
 ASL_AC,
 ANC_IM,
 NOP_AB,
 ORA_AB,
 ASL_AB,
 SLO_AB,

BPL_,//1
 ORA_IY,
 JAM_2,
 SLO_IY,
 NOP_ZX,
 ORA_ZX,
 ASL_ZX,
 SLO_ZX,
 CLC_,
 ORA_AY,
 NOP_2,
 SLO_AY,
 NOP_AX,
 ORA_AX,
 ASL_AX,
 SLO_AX,

JSR_AB,//2
 AND_IX,
 JAM_3,
 RLA_IX,
 BIT_ZP,
 AND_ZP,
 ROL_ZP,
 RLA_ZP,
 PLP_,
 AND_IM,
 ROL_AC,
 ANC_IM2,
 BIT_AB,
 AND_AB,
 ROL_AB,
 RLA_AB,

BMI_,//3
 AND_IY,
 JAM_4,
 RLA_IY,
 NOP_ZX2,
 AND_ZX,
 ROL_ZX,
 RLA_ZX,
 SEC_,
 AND_AY,
 NOP_3,
 RLA_AY,
 NOP_AX2,
 AND_AX,
 ROL_AX,
 RLA_AX,

RTI_,//4
 EOR_IX,
 JAM_5,
 SRE_IX,
 NOP_ZP2,
 EOR_ZP,
 LSR_ZP,
 SRE_ZP,
 PHA_,
 EOR_IM,
 LSR_AC,
 ASR_IM,
 JMP_AB,
 EOR_AB,
 LSR_AB,
 SRE_AB,

BVC_,//5
 EOR_IY,
 JAM_6,
 SRE_IY,
 NOP_ZX3,
 EOR_ZX,
 LSR_ZX,
 SRE_ZX,
 CLI_,
 EOR_AY,
 NOP_4,
 SRE_AY,
 NOP_AX3,
 EOR_AX,
 LSR_AX,
 SRE_AX,

RTS_,//6
 ADC_IX,
 JAM_7,
 RRA_IX,
 NOP_ZP3,
 ADC_ZP,
 ROR_ZP,
 RRA_ZP,
 PLA_,
 ADC_IM,
 ROR_AC,
 ARR_IM,
 JMP_IN,
 ADC_AB,
 ROR_AB,
 RRA_AB,

BVS_,//7
 ADC_IY,
 JAM_8,
 RRA_IY,
 NOP_ZX4,
 ADC_ZX,
 ROR_ZX,
 RRA_ZX,
 SEI_,
 ADC_AY,
 NOP_5,
 RRA_AY,
 NOP_AX4,
 ADC_AX,
 ROR_AX,
 RRA_AX,

NOP_IM,//8
 STA_IX,
 NOP_IM2,
 SAX_IX,
 STY_ZP,
 STA_ZP,
 STX_ZP,
 SAX_ZP,
 DEY_,
 NOP_IM3,
 TXA_,
 ANE_IM,
 STY_AB,
 STA_AB,
 STX_AB,
 SAX_AB,

BCC_,//9
 STA_IY,
 JAM_9,
 SHA_IY,
 STY_ZX,
 STA_ZX,
 STX_ZX,
 SAX_ZY,
 TYA_,
 STA_AY,
 TXS_,
 SHS_AY,
 SHY_AX,
 STA_AX,
 SHX_AY,
 SHA_AY,

LDY_IM,//a
 LDA_IX,
 LDX_IM,
 LAX_IX,
 LDY_ZP,
 LDA_ZP,
 LDX_ZP,
 LAX_ZP,
 TAY_,
 LDA_IM,
 TAX_,
 LXA_IM,
 LDY_AB,
 LDA_AB,
 LDX_AB,
 LAX_AB,

BCS_,//b
 LDA_IY,
 JAM_10,
 LAX_IY,
 LDY_ZX,
 LDA_ZX,
 LDX_ZY,
 LAX_ZY,
 CLV_,
 LDA_AY,
 TSX_,
 LAE_AY,
 LDY_AX,
 LDA_AX,
 LDX_AY,
 LAX_AY,

CPY_IM,//c
 CMP_IX,
 NOP_IM4,
 DCP_IX,
 CPY_ZP,
 CMP_ZP,
 DEC_ZP,
 DCP_ZP,
 INY_,
 CMP_IM,
 DEX_,
 SBX_IM,
 CPY_AB,
 CMP_AB,
 DEC_AB,
 DCP_AB,

BNE_,//d
 CMP_IY,
 JAM_11,
 DCP_IY,
 NOP_ZX5,
 CMP_ZX,
 DEC_ZX,
 DCP_ZX,
 CLD_,
 CMP_AY,
 NOP_6,
 DCP_AY,
 NOP_AX5,
 CMP_AX,
 DEC_AX,
 DCP_AX,

CPX_IM,//e
 SBC_IX,
 NOP_IM5,
 ISB_IX,
 CPX_ZP,
 SBC_ZP,
 INC_ZP,
 ISB_ZP,
 INX_,
 SBC_IM,
 NOP_,
 SBC_IM2,
 CPX_AB,
 SBC_AB,
 INC_AB,
 ISB_AB,

BEQ_,//f
 SBC_IY,
 JAM_12,
 ISB_IY,
 NOP_ZX6,
 SBC_ZX,
 INC_ZX,
 ISB_ZX,
 SED_,
 SBC_AY,
 NOP_7,
 ISB_AY,
 NOP_AX6,
 SBC_AX,
 INC_AX,
 ISB_AX,

INN /* # of instructions */
};

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