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A USB port is both an input and an output.
input
output
Input port
output
output
output cause the parallel port is outside the computer
usually sensor or digitized voltages on the inputs. if the port is parallel port, the input doesn't have to be serialized first. Output ports usually converted back to analog for some control application via D/A converters
some kind of port also called a i/o port for input/output on the computer
wafi gila
ps/2
PS/2