This is an old post, preserved for reference.
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This is the fifth parts of the repair and restoration of a Commodore Pet 4032, you might want to start at Part 1. The story so far, the video circuits are now fixed, and the Pet is working, but only because it is using a ROM and ROM replacement plug in board. It's almost like the original design for the BBC, a main unit to provide I/O, video, keyboard etc., and a seperate unit with processor, ROM and RAM. Only in this case, they share a CPU. I could leave it like that. It is working, but I'd rather remove it and get back to the PET running on it's own.
(well, OK, the next step was actually the FAT40 conversion)