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hai
the logic is very simple
when u r writing data to the port
u can say it's as an output port
when u r reading from the port
u can say the port is input.
this way you can use the same port as either input/output/both.
but u will have to configure before reading from /writting to the port
this is done by writting either 00h or ffh to the port before the actual read/write
hope that the idea is clear
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