Gregory's Server(original Twitter thread about the repair https://twitter.com/TubeTimeUS/status/1400990452233342976)
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6 comments
 @root42 the OA reference manual describes them pretty well. you probably could but they're a bit too big for a cpld  @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.