net.sf.applecommander:acdasm

Apple Disassembler

This project is primarily created to supply a reusable Java disassembler for the AppleCommander project.

CLI

$ acdasm --help                                
Usage: acdasm [-hV] [--[no-]hide-labels] [-a=<startAddress>]
              [--offset=<offset>] [--labels=<labels>[,<labels>...]]... [--6502X
              | --65C02 | --6502S | --6502 | --SWEET16] <file>

AC Disassembler.
      <file>               File to disassemble.

Options:
  -a, --addr, --origin=<startAddress>
                           Set start address for application.
  -h, --help               Show this help message and exit.
      --[no-]hide-labels   Hide labels.
      --labels=<labels>[,<labels>...]
                           Select which library labels to load (default =
                             'All'; options are 'F800', 'Applesoft', 'ProDOS',
                             'DOS33', 'None').
      --offset=<offset>    Skip offset bytes into binary before disassembling.
  -V, --version            Print version information and exit.

CPU Selection:
      --6502               MOS 6502.
      --6502S              MOS 6502 with SWEET16 switching.
      --6502X              MOS 6502 + 'illegal' instructions.
      --65C02              WDC 65C02.
      --SWEET16            SWEET16.

Sample runs:

$ acdasm --6502 -a 0x220 COPY.OBJ1.bin         
0220- 88        L0220      DEY
0221- B0 02                BCS L0225
0223- A0 B7                LDY #$B7
0225- A9 89     L0225      LDA #$89
0227- 20 80 02             JSR L0280
...

The 6502/SWEET16 switching mode will switch to SWEET16 mode if a JSR $F689 occurs in code and switch back to 6502 mode when a SWEET16 RTN instruction is encountered:

$ acdasm -a 0x800 --6502S renumber.bin
0800- 20 89 F6             JSR $F689
0803-                      .SWEET16
0803- 11 CA 00             SET R1,#$00CA
0806- 61                   LDD @R1
0807- 31                   ST R1
0808- 12 0A 00             SET R2,#$000A
080B- 13 4C 00             SET R3,#$004C
080E- 63                   LDD @R3
080F- 33                   ST R3
0810- 14 DE 03             SET R4,#$03DE
0813- 21        L0813      LD R1
0814- D3                   CPR R3
0815- 03 0E     L0825      BC $0825
0817- 41                   LD @R1
0818- 35                   ST R5
0819- 24                   LD R4
081A- A2                   ADD R2
081B- 34                   ST R4
081C- 71                   STD @R1
081D- F1                   DCR R1
081E- F1                   DCR R1
081F- F1                   DCR R1
0820- 21                   LD R1
0821- A5                   ADD R5
0822- 31                   ST R1
0823- 01 EE     L0813      BR $0813
0825- 00        L0825      RTN
0826-                      .6502
0826- 60                   RTS

Labels can also be toggled off:

$ acdasm --SWEET16 --no-labels sw16.sample2.bin
0300- 11 00 0A  SET R1,#$0A00
0303- 12 80 0A  SET R2,#$0A80
0306- 13 23 00  SET R3,#$0023
0309- 41        LD @R1
030A- 52        ST @R2
030B- F3        DCR R3
030C- 07 FB     BNZ $0309
030E- 00        RTN