alt Hacker News"No internal ROM" might mean that it relies on a bunch of custom PLA chips which would not be an improvement. With a ROM there is at least a chance you can dump it and run a disassembler on the contents to figure out what it is trying to do.
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evoke4908 • 12/09/2024
Doesn't a PLA just boil down to a truth table that you can dump the same way? Or am I thinking of the other kind of programmable logic chip used for this purpose? GAL, I think?
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lnsru • 12/09/2024
Looks like there is regular EPROM in this case. Nothing too ugly. Except very old microprocessor.
Nope, I've got complete schematics, and a dump of the EPROM. It's going to take a while to figure out how the heck why it's hallucinating a power failure (the signals going into the CPU are appropriate).