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Questions tagged [ports]

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4 votes
1 answer
408 views

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 ...
smitelli's user avatar
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6 votes
2 answers
2k views

How did the BBC sideways ROM software for the AMX mouse process the user port input data to determine x and y movement?

This mouse plugged into the user port on the underside of the BBC micro models. The mouse came with software in the form of a sideways ROM which provided APIs, CLI commands for own programs as well as ...
therobyouknow's user avatar