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2 questions
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What 8-bit microcomputer systems multiplexed multiple physical ports on a single controller?
The NEC PC-8201 had three serial interface ports on the back,
"RS-232," "SIO1" and "SIO2." These were all driven by a single IM6402
USART, switched between each physical port via bits 7 and 6 of IO ...
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4
votes
1
answer
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Did the IBM Game Control Adapter have I/O port aliases?
I was taking a look at the logic diagram in the manual for the original IBM game port adapter card:
In the upper-left corner of the schematic, there is the circuitry responsible for decoding the I/O ...
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