glitch
Veteran Member
Finally getting around to messing with this one:
It's a CGRS MPU, a vintage 6502 CPU board for the S-100 bus!
This is an older revision than I can find documentation for -- everything online is for the rev 4 board, it appears I have rev 2. This one doesn't match the schematics, doesn't have the connector for the CGRS front panel, uses 1702A EPROMs instead of 2708s, and may not drive the SINP and SOUT lines necessary for most S-100 I/O boards (they don't connect anywhere, but maybe there are jumpers missing).
The sockets on this board are pretty bad, so I'm probably going to have to strip them off and re-socket. Since it's going to be mostly bare anyway, should we do a reproduction? They're not exactly cheap to do.
EDIT: I can't figure out how to stick a survey on! So, if you're interested in a reproduction, just reply on the thread. Options are:
* Straight 1:1 reproduction
* Reproduction with newer ROMs and/or RAMs
* Workalike that follows the same basic layout but upgrades some stuff
It's a CGRS MPU, a vintage 6502 CPU board for the S-100 bus!
This is an older revision than I can find documentation for -- everything online is for the rev 4 board, it appears I have rev 2. This one doesn't match the schematics, doesn't have the connector for the CGRS front panel, uses 1702A EPROMs instead of 2708s, and may not drive the SINP and SOUT lines necessary for most S-100 I/O boards (they don't connect anywhere, but maybe there are jumpers missing).
The sockets on this board are pretty bad, so I'm probably going to have to strip them off and re-socket. Since it's going to be mostly bare anyway, should we do a reproduction? They're not exactly cheap to do.
EDIT: I can't figure out how to stick a survey on! So, if you're interested in a reproduction, just reply on the thread. Options are:
* Straight 1:1 reproduction
* Reproduction with newer ROMs and/or RAMs
* Workalike that follows the same basic layout but upgrades some stuff