Quote:
Originally Posted by SiriusHardware
Actually I think it's OK for the BANK SEL signal to be 50/50 because the first 32K is reserved for system RAM (and nothing else) whether it is fully occupied by RAM or not. If you want to try to write to or read from RAM which isn't actually fitted, well, that's your affair...
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I just thought it possible that if the 16K is mirrored at 0-3FFF and 4000-7FFF that it could cause some issue with the pet detecting how much ram is fitted. It might write over zero page and stack while testing ram from 4000-7FFF.
Also if one of the links is missing, the input to the 7425 would be floating. Probably not a major issue for standard TTL but could be unreliable in the longer term.