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A standard parallel port (SPP) is a port for connecting various relatively high bandwidth peripherals, most commonly printers, to a PC. Later versions of the SPP allow duplex communication. They use the DB-25 connector. The original SPP, by Centronics, was introduced in 1970 and soon became the de facto industry standard. However, a number of different manufacturers used the SPP with a variety of connectors, such as the DC-35, the DD50 and the M50.
This term is also known as parallel port, printer port, Centronics port or Centronics interface.
Centronics was the company that designed the original standard for parallel communication between a computer and a printer. A newer design of the SPP, using the same DB-25 connector, is called the enhanced parallel port (EPP), or extended capabilities port (ECP). These newer ports were introduced by IBM in 1987 and had data transfer rates 10 times faster than the original SPP. In fact, only IBM logo printers, which were rebranded from Epson, could be used with IBM PCs. HP introduced its version of the EPP in 1992. But by 1994, all these interfaces were superseded by the IEEE 1284 standard.
Dongles, Zip drives and scanners were some of the early peripherals using the SPP. Other later uses included sound cards, webcams, joysticks, modems, hard drives and CD-ROM drives. Today, USB and Ethernet connections have effectively replaced the SPP and computer manufacturers consider it a legacy port.