Email or username:

Password:

Forgot your password?
Tube❄️Time's posts Post Back to profile
Top-level
Tube❄️Time

dumped the PROM. it seems to be part of the address decoding process or memory mapping.
21 April at 0:59 | Open on mastodon.social
6 comments
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.

21 April at 2:05 | Open on mastodon.social
William D. Jones replied to Tube❄️Time

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

21 April at 2:06 | Open on mastodon.social
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!
21 April at 2:06 | Open on mastodon.social
Tube❄️Time replied to Tube❄️Time

yeah sure looks identical. welp, now we know how it works, lol.
21 April at 2:11 | Open on mastodon.social
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

21 April at 18:00 | Open on mastodon.social
root42 replied to Tube❄️Time

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

21 April at 6:30 | Open on chaos.social
Go Up