(original Twitter thread about the repair https://twitter.com/TubeTimeUS/status/1400990452233342976)
so it's not something you can really clone unless you have the IBM custom chips, but here's the schematic and board layout: https://github.com/schlae/EGACard
Creative Commons license as usual.
@tubetime Question is what do the custom chips do and can they be emulated?
@root42 the OA reference manual describes them pretty well. you probably could but they're a bit too big for a cpld
@tubetime Maybe a job for a RP2040?
@root42 doubt it is fast enough. these chips are running at video rates.
@tubetime true. But you can run it up to 400MHz. Question is if it can react fast enough to register changes in the emulated chip…
so it's not something you can really clone unless you have the IBM custom chips, but here's the schematic and board layout: https://github.com/schlae/EGACard
Creative Commons license as usual.