More questions...
Sounds interesting, the expansion board and the other stuff. I assume that if one is so inclined, they could (after verifying that it works correctly) use a more modern EPROM (like a 2716) with a bit of "blue wires" added. That would be twice the 4x1702's. Besides easier to get and modify.
Do you have any pointers to the memory layout of the Altair 680?
Somewhere I saw a listing of the internal (EPROM) code. Pointers to that either?
All of this is getting me interested.
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