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Tube❄️Time

the scan was a little tricky to stitch together since the board is longer than my scanner 😅
20 January at 3:22 | Open on mastodon.social
13 comments
Tube❄️Time

progress. that's a lot of ratsnest!
20 January at 3:22 | Open on mastodon.social
Tube❄️Time
Tube❄️Time

so what is the card? it's an original IBM EGA! here it is with all the components on it.
20 January at 3:25 | Open on mastodon.social
Tube❄️Time

one of the custom IBM gate array chips is broken, so I didn't feel too bad about removing every single last chip
20 January at 3:26 | Open on mastodon.social
Tube❄️Time
Tube❄️Time

so it's not something you can really clone unless you have the IBM custom chips, but here's the schematic and board layout: github.com/schlae/EGACard

Creative Commons license as usual.

20 January at 3:28 | Open on mastodon.social
root42

@tubetime Question is what do the custom chips do and can they be emulated?

20 January at 8:11 | Open on chaos.social
Tube❄️Time

@root42 the OA reference manual describes them pretty well. you probably could but they're a bit too big for a cpld

20 January at 17:16 | Open on mastodon.social
root42
Tube❄️Time replied to root42

@root42 doubt it is fast enough. these chips are running at video rates.

20 January at 20:29 | Open on mastodon.social
root42 replied to Tube❄️Time

@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…

20 January at 20:33 | Open on chaos.social
Dustin

@tubetime I love those Saleae Logic Analyzers. I have one of the originals with only 4 channels and 10MSps.

20 January at 3:53 | Open on geekdom.social
Marsh Ray
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