Illegal Opcode Support for the Final Cartridge III Monitor

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The monitor built into the Final Cartridge III is one of the best ones for the C64. Some of its unique features are:

  • dumping PETSCII (I comand), character sets (EC) and sprites (ES)
  • F3/F5 for scrolling, including backwards disassembly
  • drive mode (OD) to view and change RAM of a drive and execute code there

I have previously released a reverse-engineered version of the monitor that runs stand-alone on a C64, and an adaptation for the monitor to run on the TED series (C16, C116, Plus/4).

The monitor’s biggest weakness is its lack of support for illegal opcodes. I have now added this support.

The source is available on github:

https://github.com/mist64/final_cartridge

See the build instructions there on how to enable illegal opcode support.

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