________________________________
From: Andrew Lynch <lynchaj at yahoo.com>
Hi
I did a quick look at the IBM PGC and it is enormous.? I doubt very much it is a viable
option unless there were later models that were a lot more compact.? The original IBM PGC
spans *three* ISA boards!? Even using modern DRAMs there is not practical way to fit it on
to an S-100 board.
C: Actually it occupies 2 ISA slots, and has a 3rd board between those (the CGA emulator).
No I'd agree it's impractical to duplicate it's functionality in discrete
logic for an s-100 board. And no there weren't later versions. But it is an
interesting item that, while irrelevant to this post, uses a standard 8088 and a DAC
that's similar to the one used in the IBM PS/2's. It would be interesting to
compress all that glue into 1 or 2? asics. But that's defeating the purpose of
implementing such a card based on it's almost exclusive use of off the shelf parts.
?I do have a miserably disorganized set of docs that includes the PGC, schematics even I
believe. If you're interested, let me know.
?And next time I'd go multibus ;)