Maschinencode-Befehle
---------------------

Die implementierten Maschinencode-Befehle erhaelt man durch den
Aufruf von

  python cpu6502.py --commands

Aus Darstellungsgruenden ist die Tabelle zweigeteilt. Der erste
Teil enthaelt die Opcodes:

  $00 - $07
  ...
  $F0 - $F7

und der zweite Teil die Opcodes:

  $08 - $0F
  ...
  $F8 - $FF


Abkuerzungen der Adressierungsarten:

  A:      Akku
  #:      direkt
  aa:     Zeropage bzw. relativ (bei Branch)
  aa,x:   Zeropage, x-indiziert
  (aa),y: Zeropage indirekt, y-indiziert
  aaaa:   absolut
  aaaa,x: absolut, x-indiziert
  aaaa,y: absolut, y-indiziert



  |   0   |   1   |   2   |   3   |   4   |   5   |   6   |   7   
--+-------+-------+-------+-------+-------+-------+-------+-------
0x|  BRK  |       |       |       |       |  ORA  |  ASL  |       
  |       |       |       |       |       |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
1x|  BPL  |       |       |       |       |       |  ASL  |       
  |   aa  |       |       |       |       |       |  aa,X |       
--+-------+-------+-------+-------+-------+-------+-------+-------
2x|  JSR  |       |       |       |  BIT  |  AND  |  ROL  |       
  |  aaaa |       |       |       |   aa  |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
3x|  BMI  |       |       |       |       |       |       |       
  |   aa  |       |       |       |       |       |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
4x|  RTI  |       |       |       |       |  EOR  |  LSR  |       
  |       |       |       |       |       |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
5x|  BVC  |       |       |       |       |       |  LSR  |       
  |   aa  |       |       |       |       |       |  aa,X |       
--+-------+-------+-------+-------+-------+-------+-------+-------
6x|  RTS  |       |       |       |       |  ADC  |  ROR  |       
  |       |       |       |       |       |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
7x|  BVS  |       |       |       |       |  ADC  |       |       
  |   aa  |       |       |       |       |  aa,X |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
8x|       |       |       |       |  STY  |  STA  |  STX  |       
  |       |       |       |       |   aa  |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
9x|  BCC  |  STA  |       |       |  STY  |  STA  |       |       
  |   aa  | (aa),Y|       |       |  aa,X |  aa,X |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Ax|  LDY  |       |  LDX  |       |  LDY  |  LDA  |  LDX  |       
  |   #   |       |   #   |       |   aa  |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Bx|  BCS  |  LDA  |       |       |  LDY  |  LDA  |       |       
  |   aa  | (aa),Y|       |       |  aa,X |  aa,X |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Cx|  CPY  |       |       |       |  CPY  |  CMP  |  DEC  |       
  |   #   |       |       |       |   aa  |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Dx|  BNE  |       |       |       |       |       |  DEC  |       
  |   aa  |       |       |       |       |       |  aa,X |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Ex|  CPX  |       |       |       |  CPX  |  SBC  |  INC  |       
  |   #   |       |       |       |   aa  |   aa  |   aa  |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Fx|  BEQ  |       |       |       |       |       |  INC  |       
  |   aa  |       |       |       |       |       |  aa,X |       


  |   8   |   9   |   A   |   B   |   C   |   D   |   E   |   F   
--+-------+-------+-------+-------+-------+-------+-------+-------
0x|  PHP  |  ORA  |  ASL  |       |       |  ORA  |       |       
  |       |   #   |   A   |       |       |  aaaa |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
1x|  CLC  |       |       |       |       |       |       |       
  |       |       |       |       |       |       |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
2x|  PLP  |  AND  |  ROL  |       |  BIT  |  AND  |       |       
  |       |   #   |   A   |       |  aaaa |  aaaa |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
3x|  SEC  |       |       |       |       |       |       |       
  |       |       |       |       |       |       |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
4x|  PHA  |  EOR  |  LSR  |       |  JMP  |  EOR  |       |       
  |       |   #   |   A   |       |  aaaa |  aaaa |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
5x|  CLI  |       |       |       |       |       |       |       
  |       |       |       |       |       |       |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
6x|  PLA  |  ADC  |  ROR  |       |  JMP  |  ADC  |       |       
  |       |   #   |   A   |       | (aaaa)|  aaaa |       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
7x|  SEI  |  ADC  |       |       |       |  ADC  |       |       
  |       | aaaa,Y|       |       |       | aaaa,X|       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
8x|  DEY  |       |  TXA  |       |  STY  |  STA  |  STX  |       
  |       |       |       |       |  aaaa |  aaaa |  aaaa |       
--+-------+-------+-------+-------+-------+-------+-------+-------
9x|  TYA  |  STA  |       |       |       |  STA  |       |       
  |       | aaaa,Y|       |       |       | aaaa,X|       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Ax|  TAY  |  LDA  |  TAX  |       |  LDY  |  LDA  |  LDX  |       
  |       |   #   |       |       |  aaaa |  aaaa |  aaaa |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Bx|  CLV  |  LDA  |       |       |       |  LDA  |       |       
  |       | aaaa,Y|       |       |       | aaaa,X|       |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Cx|  INY  |  CMP  |  DEX  |       |  CPY  |  CMP  |  DEC  |       
  |       |   #   |       |       |  aaaa |  aaaa |  aaaa |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Dx|       |  CMP  |       |       |       |  CMP  |  DEC  |       
  |       | aaaa,Y|       |       |       | aaaa,X| aaaa,X|       
--+-------+-------+-------+-------+-------+-------+-------+-------
Ex|  INX  |  SBC  |  NOP  |       |  CPX  |  SBC  |  INC  |       
  |       |   #   |       |       |  aaaa |  aaaa |  aaaa |       
--+-------+-------+-------+-------+-------+-------+-------+-------
Fx|       |  SBC  |       |       |       |  SBC  |  INC  |       
  |       | aaaa,Y|       |       |       | aaaa,X| aaaa,X|