## Input/Output Device Driver Reference

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### Physical Bidirectional Parallel Port Device Driver

The OS/2 base device driver, PAR1284.SYS, is a bus-independent device driver that supports bidirectional communication across the parallel port to bidirectional capable peripherals. The protocol is described as half- duplex (either the host or peripheral can transmit at a given point in time ) in a master-slave relationship (the host determines who can transmit and when).