Updated: 04/26/2017 by Computer Hope

BidirectionalBidirectional is a communications mode that is capable of transmitting data in both directions (send and receive), but not at the same time. Bi-di (bidirectional) is also a printer port mode that was first introduced by IBM in 1987 with their introduction of the PS/2 computer.

The bidirectional port is an 8-bit port capable of transmitting between 75 and 300 KBps that was available as either a type 1 or type 3 port, which used a DMA.

Parallel port, Printing terms, Unidirectional