I'm writing a new pretty printer for 6502 assembler. Ultimately the goal is to read in any common format and write it back out in any other common format. So far it handles CA65 code and the Microtek assembler used by Atari when developing the 400/800.
I am not so familiar with the Commodore side of things. I did come across https://github.com/mist64/cbmsrc, but this seems to have been broken down into many separate files, which I suspect were originally one larger one? If so, is that single file out there somewhere?
Can someone describe the system they used to build, say, the PET ROMs and what assembler platform was used ?