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A parallel port is a computer interface used for connecting peripheral devices like printers and scanners by transferring multiple bits of data simultaneously over multiple wires. It was common on older PCs but has been largely replaced by faster, smaller interfaces like USB. The original parallel port had a data transfer rate of about 150 KB/s, though later versions supported faster, bidirectional communication.

How it works

Data transfer: The name "parallel" comes from how it sends multiple bits of data at the same time over parallel wires, unlike a serial port which sends one bit at a time.

Physical connector: A common physical connector for a parallel port is the DB-25, a 25-pin connector.

Communication protocols:

SPP (Standard Parallel Port): The original, unidirectional mode.

EPP (Enhanced Parallel Port) and ECP (Extended Capabilities Port): Later modes that supported bidirectional communication and faster speeds, sometimes using DMA (Direct Memory Access).

Uses: Primarily used for printers, but also for scanners and external storage devices like ZIP drives.

Handshake signals: Control signals were used to coordinate data transfer between the computer and the peripheral.