Anyone have a schematic for the Saturn 128k ram card? I'm trying to get
RoboCAD going on my 2e and of course the memory expansion it requires doesn't
work :-(.
When I run the RAMTEST128K program it fails immediately with a message that it
cannot write memory after two pokes. The Ram read LED (closest to the rear of
the card) is stuck on. Interestingly, the machine does not respond to a
Ctrl-Reset (!) and must be power-cycled. Never seen that one before.
I suppose I could start changing out LS TTL chips blindly, but wanted to see
if anyone had experience with the card.