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by platevoltage 21 days ago
Surely there's a parallel EPROM somewhere in there you can bake with a UV light and program.
2 comments

No, it's all on-chip.

There's a big custom chip made by GEC Plessey that has a small flash chip beside it, but it's totally undocumented. They also make the custom chips in the door, window switch, and seat outstations. I found some very very general documentation about them but nothing enough to start picking the firmware apart.

The 68HCxxx's typically have on chip ROMs.