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Tube❄️Time

so this board looks like it does both XMS (extended memory) and EMS (expanded memory). expanded memory is banked and uses a 64K (iirc) window to access it.

5 comments
William D. Jones replied to Tube❄️Time

@tubetime Ahhh, so it's like the AST RAMpage 286 :D!

Tube❄️Time replied to Tube❄️Time

well crap, this board appears to be a clone of the Intel Above Board Plus 8 card. it sure looks the same!

Tube❄️Time replied to Tube❄️Time

yeah sure looks identical. welp, now we know how it works, lol.

Tube❄️Time replied to Tube❄️Time

OK, here are the KiCad files. it's not really a fab-able design because there are still DRC errors, but at least the schematic is useful.

github.com/schlae/XebecAboveBo

root42 replied to Tube❄️Time

@tubetime but has it ever been reverse engineered before…? That would be a bummer. But if not: success!

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