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6502 Instruction Set

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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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  1. enum{
  2.  BRK_,//0
  3.  ORA_IX,
  4.  JAM_,
  5.  SLO_IX,
  6.  NOP_ZP,
  7.  ORA_ZP,
  8.  ASL_ZP,
  9.  SLO_ZP,
  10.  PHP_,
  11.  ORA_IM,
  12.  ASL_AC,
  13.  ANC_IM,
  14.  NOP_AB,
  15.  ORA_AB,
  16.  ASL_AB,
  17.  SLO_AB,
  18.  
  19.  
  20.  BPL_,//1
  21.  ORA_IY,
  22.  JAM_2,
  23.  SLO_IY,
  24.  NOP_ZX,
  25.  ORA_ZX,
  26.  ASL_ZX,
  27.  SLO_ZX,
  28.  CLC_,
  29.  ORA_AY,
  30.  NOP_2,
  31.  SLO_AY,
  32.  NOP_AX,
  33.  ORA_AX,
  34.  ASL_AX,
  35.  SLO_AX,
  36.  
  37.  JSR_AB,//2
  38.  AND_IX,
  39.  JAM_3,
  40.  RLA_IX,
  41.  BIT_ZP,
  42.  AND_ZP,
  43.  ROL_ZP,
  44.  RLA_ZP,
  45.  PLP_,
  46.  AND_IM,
  47.  ROL_AC,
  48.  ANC_IM2,
  49.  BIT_AB,
  50.  AND_AB,
  51.  ROL_AB,
  52.  RLA_AB,
  53.  
  54.  BMI_,//3
  55.  AND_IY,
  56.  JAM_4,
  57.  RLA_IY,
  58.  NOP_ZX2,
  59.  AND_ZX,
  60.  ROL_ZX,
  61.  RLA_ZX,
  62.  SEC_,
  63.  AND_AY,
  64.  NOP_3,
  65.  RLA_AY,
  66.  NOP_AX2,
  67.  AND_AX,
  68.  ROL_AX,
  69.  RLA_AX,
  70.  
  71.  RTI_,//4
  72.  EOR_IX,
  73.  JAM_5,
  74.  SRE_IX,
  75.  NOP_ZP2,
  76.  EOR_ZP,
  77.  LSR_ZP,
  78.  SRE_ZP,
  79.  PHA_,
  80.  EOR_IM,
  81.  LSR_AC,
  82.  ASR_IM,
  83.  JMP_AB,
  84.  EOR_AB,
  85.  LSR_AB,
  86.  SRE_AB,
  87.  
  88.  BVC_,//5
  89.  EOR_IY,
  90.  JAM_6,
  91.  SRE_IY,
  92.  NOP_ZX3,
  93.  EOR_ZX,
  94.  LSR_ZX,
  95.  SRE_ZX,
  96.  CLI_,
  97.  EOR_AY,
  98.  NOP_4,
  99.  SRE_AY,
  100.  NOP_AX3,
  101.  EOR_AX,
  102.  LSR_AX,
  103.  SRE_AX,
  104.  
  105.  RTS_,//6
  106.  ADC_IX,
  107.  JAM_7,
  108.  RRA_IX,
  109.  NOP_ZP3,
  110.  ADC_ZP,
  111.  ROR_ZP,
  112.  RRA_ZP,
  113.  PLA_,
  114.  ADC_IM,
  115.  ROR_AC,
  116.  ARR_IM,
  117.  JMP_IN,
  118.  ADC_AB,
  119.  ROR_AB,
  120.  RRA_AB,
  121.  
  122.  BVS_,//7
  123.  ADC_IY,
  124.  JAM_8,
  125.  RRA_IY,
  126.  NOP_ZX4,
  127.  ADC_ZX,
  128.  ROR_ZX,
  129.  RRA_ZX,
  130.  SEI_,
  131.  ADC_AY,
  132.  NOP_5,
  133.  RRA_AY,
  134.  NOP_AX4,
  135.  ADC_AX,
  136.  ROR_AX,
  137.  RRA_AX,
  138.  
  139.  NOP_IM,//8
  140.  STA_IX,
  141.  NOP_IM2,
  142.  SAX_IX,
  143.  STY_ZP,
  144.  STA_ZP,
  145.  STX_ZP,
  146.  SAX_ZP,
  147.  DEY_,
  148.  NOP_IM3,
  149.  TXA_,
  150.  ANE_IM,
  151.  STY_AB,
  152.  STA_AB,
  153.  STX_AB,
  154.  SAX_AB,
  155.  
  156.  BCC_,//9
  157.  STA_IY,
  158.  JAM_9,
  159.  SHA_IY,
  160.  STY_ZX,
  161.  STA_ZX,
  162.  STX_ZX,
  163.  SAX_ZY,
  164.  TYA_,
  165.  STA_AY,
  166.  TXS_,
  167.  SHS_AY,
  168.  SHY_AX,
  169.  STA_AX,
  170.  SHX_AY,
  171.  SHA_AY,
  172.  
  173.  LDY_IM,//a
  174.  LDA_IX,
  175.  LDX_IM,
  176.  LAX_IX,
  177.  LDY_ZP,
  178.  LDA_ZP,
  179.  LDX_ZP,
  180.  LAX_ZP,
  181.  TAY_,
  182.  LDA_IM,
  183.  TAX_,
  184.  LXA_IM,
  185.  LDY_AB,
  186.  LDA_AB,
  187.  LDX_AB,
  188.  LAX_AB,
  189.  
  190.  BCS_,//b
  191.  LDA_IY,
  192.  JAM_10,
  193.  LAX_IY,
  194.  LDY_ZX,
  195.  LDA_ZX,
  196.  LDX_ZY,
  197.  LAX_ZY,
  198.  CLV_,
  199.  LDA_AY,
  200.  TSX_,
  201.  LAE_AY,
  202.  LDY_AX,
  203.  LDA_AX,
  204.  LDX_AY,
  205.  LAX_AY,
  206.  
  207.  CPY_IM,//c
  208.  CMP_IX,
  209.  NOP_IM4,
  210.  DCP_IX,
  211.  CPY_ZP,
  212.  CMP_ZP,
  213.  DEC_ZP,
  214.  DCP_ZP,
  215.  INY_,
  216.  CMP_IM,
  217.  DEX_,
  218.  SBX_IM,
  219.  CPY_AB,
  220.  CMP_AB,
  221.  DEC_AB,
  222.  DCP_AB,
  223.  
  224.  BNE_,//d
  225.  CMP_IY,
  226.  JAM_11,
  227.  DCP_IY,
  228.  NOP_ZX5,
  229.  CMP_ZX,
  230.  DEC_ZX,
  231.  DCP_ZX,
  232.  CLD_,
  233.  CMP_AY,
  234.  NOP_6,
  235.  DCP_AY,
  236.  NOP_AX5,
  237.  CMP_AX,
  238.  DEC_AX,
  239.  DCP_AX,
  240.  
  241.  CPX_IM,//e
  242.  SBC_IX,
  243.  NOP_IM5,
  244.  ISB_IX,
  245.  CPX_ZP,
  246.  SBC_ZP,
  247.  INC_ZP,
  248.  ISB_ZP,
  249.  INX_,
  250.  SBC_IM,
  251.  NOP_,
  252.  SBC_IM2,
  253.  CPX_AB,
  254.  SBC_AB,
  255.  INC_AB,
  256.  ISB_AB,
  257.  
  258.  BEQ_,//f
  259.  SBC_IY,
  260.  JAM_12,
  261.  ISB_IY,
  262.  NOP_ZX6,
  263.  SBC_ZX,
  264.  INC_ZX,
  265.  ISB_ZX,
  266.  SED_,
  267.  SBC_AY,
  268.  NOP_7,
  269.  ISB_AY,
  270.  NOP_AX6,
  271.  SBC_AX,
  272.  INC_AX,
  273.  ISB_AX,
  274.  
  275.  INN /* # of instructions */
  276. };

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