The big ol'table of 6502 opcodes makes more sense in octal.
note: b is a byte operand, w is a word operand, [] means 
accessing memory at the address inside. Opcodes with ? are unofficial.
     0       1        2       3          4          5        6       7
00  BRK   ORA[[b+X]]  XX  SLO[[b+X]]?  NOP[b]?   ORA[b]   ASL[b]   SLO[b]?
01  PHP     ORA b   ASL A   ANC b?     NOP[w]?   ORA[w]   ASL[w]   SLO[w]?
02 BPL b  ORA[[b]+Y]  XX  SLO[[b]+Y]? NOP[b+X]? ORA[b+X] ASL[b+X] SLO[b+X]?
03  CLC    ORA[w+Y]  NOP?  SLO[w+Y]?  NOP[w+X]? ORA[w+X] ASL[w+X] SLO[w+X]?
04 JSR w  AND[[b+X]]  XX  RLA[[b+X]]?  BIT[b]    AND[b]   ROL[b]   RLA[b]?
05  PLP     AND b   ROL A   ANC b?     BIT[w]    AND[w]   ROL[w]   RLA[w]?
06 BMI b  AND[[b]+Y]  XX  RLA[[b]+Y]? NOP[b+X]? AND[b+X] ROL[b+X] RLA[b+X]?
07  SEC    AND[w+Y]  NOP?  RLA[w+Y]?  NOP[w+X]? AND[w+X] ROL[w+X] RLA[w+X]?
10  RTI   EOR[[b+X]]  XX  SRE[[b+X]]?  NOP[b]?   EOR[b]   LSR[b]   SRE[b]?
11  PHA     EOR b   LSR A   ALR b?      JMP w    EOR[w]   LSR[w]   SRE[w]?
12 BVC b  EOR[[b]+Y]  XX  SRE[[b]+Y]? NOP[b+X]? EOR[b+X] LSR[b+X] SRE[b+X]?
13  CLI    EOR[w+Y]  NOP?  SRE[w+Y]?  NOP[w+X]? EOR[w+X] LSR[w+X] SRE[w+X]?
14  RTS   ADC[[b+X]]  XX  RRA[[b+X]]?  NOP[b]?   ADC[b]   ROR[b]   RRA[b]?
15  PLA     ADC b   ROR A   ARR b?      JMP[w]   ADC[w]   ROR[w]   RRA[w]?
16 BVS b  ADC[[b]+Y]  XX  RRA[[b]+Y]? NOP[b+X]? ADC[b+X] ROR[b+X] RRA[b+X]?
17  SEI    ADC[w+Y]  NOP?  RRA[w+Y]?  NOP[w+X]? ADC[w+X] ROR[w+X] RRA[w+X]?
20 NOP b? STA[[b+X]] NOPb? SAX[[b+X]]? STY[b]    STA[b]   STX[b]   SAX[b]?
21  DEY     NOP b?   TXA      XX       STY[w]    STA[w]   STX[w]   SAX[w]?
22 BCC b  STA[[b]+Y]  XX      XX      STY[b+X]  STA[b+X] STX[b+X] SAX[b+Y]?
23  TYA    STA[w+Y]  TXS      XX        XX      STA[w+X]    XX       XX
24 LDY b  LDA[[b+X]] LDX b LAX[[b+X]]? LDY[b]    LDA[b]   LDX[b]   LAX[b]?
25  TAY     LDA b    TAX      XX       LDY[w]    LDA[w]   LDX[w]   LAX[w]?
26 BCS b  LDA[[b]+Y]  XX  LAX[[b]+Y]? LDY[b+X]  LDA[b+X] LDX[b+X] LAX[b+Y]?
27  CLV    LDA[w+Y]  TSX      XX      LDY[w+X]  LDA[w+X] LDX[w+Y] LAX[w+Y]?
30 CPY b  CMP[[b+X]] NOPb? DCP[[b+X]]? CPY[b]    CMP[b]   DEC[b]   DCP[b]?
31  INY     CMP b    DEX     AXS b?    CPY[w]    CMP[w]   DEC[w]   DCP[w]?
32 BNE b  CMP[[b]+Y]  XX  DCP[[b]+Y]? NOP[b+X]? CMP[b+X] DEC[b+X] DCP[b+X]?
33  CLD    CMP[w+Y]  NOP?  DCP[w+Y]?  NOP[w+X]? CMP[w+X] DEC[w+X] DCP[w+X]?
34 CPX b SBC[[b+X]] NOPb? ISC[[b+X]]?  CPX[b]    SBC[b]   INC[b]   ISC[b]?
35  INX     SBC b    NOP      XX       CPX[w]    SBC[w]   INC[w]   ISC[w]?
36 BEQ b SBC[[b]+Y]   XX  ISC[[b]+Y]? NOP[b+X]? SBC[b+X] INC[b+X] ISC[b+X]?
37  SED    SBC[w+Y]  NOP?  ISC[w+Y]?  NOP[w+X]? SBC[w+X] INC[w+Y] ISC[w+X]?