parallel port


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parallel port

[′par·ə‚lel ‚pȯrt]
(electronics)

parallel port

(hardware)
An interface from a computer system where data is transferred in or out in parallel, that is, on more than one wire. A parallel port carries one bit on each wire thus multiplying the transfer rate obtainable over a single wire. There will usually be some control signals on the port as well to say when data is ready to be sent or received.

The commonest kind of parallel port is a printer port, e.g. a Centronics port which transfers eight bits at a time. Disks are also connected via special parallel ports, e.g. SCSI or IDE.

parallel port

(1) A hardware interface that transfers one or more bytes simultaneously. See parallel interface.

(2) A socket on a computer used to connect a printer or other device via a parallel interface (eight data bits transferring simultaneously). In the past, the parallel port was widely used for printers and occasionally for connecting other devices externally, but was superseded by USB.

Although some business printers may still offer parallel ports, consumer-based printers and new computers have only USB. However, parallel port devices can be hooked up to new computers with a USB-to-parallel adapter cable.

It Goes Back to the 1970s
The Centronics Data Computer Corporation, a subsidiary of Wang Laboratories in the 1970s, introduced a parallel port for printers. It was adapted for the IBM PC in 1981 and enhanced and standardized by the IEEE in 1994 (see IEEE 1284). The port first appeared on plug-in cards, but was later built into the motherboard. See Centronics interface.


In Transition
As USB ports (left) began to proliferate, the parallel and serial ports (right) were included for a while, but eventually gave way entirely to USB.




In Transition
As USB ports (left) began to proliferate, the parallel and serial ports (right) were included for a while, but eventually gave way entirely to USB.
References in periodicals archive ?
The LANpress product line consists of LANpress 2000 USB, a single USB port print server that connects to the printer through a USB cable, LANpress 3P/100, a three parallel port print server that connects up to three printers to the network using standard parallel port cables, and the new LANpress 2000 1P Direct parallel port print server.
Newer PCs have transitioned away from providing on-board serial and parallel ports leaving the user with the option of replacing all of their peripheral devices (i.
Bachmann also produces the InfraReady(TM) adapter, designed to convert virtually any printer's parallel port to accept an infrared beam and the BTReady(TM) adapter, which converts a printer's parallel port to accept Bluetooth.
0, can couple to the parallel port, causing high-frequency emissions if not properly filtered.
The USB model of SecureTouch PC joins a Parallel Port model to enhance BAC's computer/network security offering.
PC-based instrumentation and data logging specialist Pico Technology has announced the immediate availability of a USB to Parallel Port Adapter for use with all of its popular low-cost, parallel port based, test and measurement products.
OnTAP tests run across a variety of inexpensive hardware interfaces such as JTAG parallel port programming cables from Insight Electronics, Xilinx, and Altera; PC-MCIA and PCI controllers from National Instruments, and on GenRad in-circuit bed of nails testers.
The adapter, which connects to the printer's parallel port, can be used with the EPSON Stylus(R) C80, EPSON Stylus C60, EPSON Stylus Photo 1280, EPSON Stylus Photo 890 and EPSON Stylus Photo 820.
California Micro Devices (Nasdaq:CAMD) announced that it has introduced the PACZIG1284, the first device to protect parallel ports against electro-magnetic interference (EMI) in PCs with frequencies from 100 MHz to 3 GHz.
Most new laptops no longer have serial and parallel ports, yet many people still use serial and parallel devices," notes Mike Ridenhour, president of Keyspan.

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