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Functions HI-TECH C INP
From HI-TECH C for CP/M Fan WIKI(EN)
INP, OUTP
SYNOPSIS
char inp(unsigned port) void outp(unsigned, unsigned data)
DESCRIPTION
These routines read and write bytes to and from I/O ports. Inp() returns the data byte read from the specified port, and outp() outputs the data byte to the specified port.