Parallel port Guide, Meaning , Facts, Information and Description
In computing, a parallel port is 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 cable (contrast serial port). There will usually be some control signals on the port as well to say when data is ready to be sent or received.It is mostly used by a microprocessor to communicate with peripherals. The most common 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 ATA.
The parallel port of an IBM-PC compatible is the only standard computer peripheral that brings standard computer logic voltages directly out to a set of pins. It is much beloved by experimenters and engineers, who often use it for inexpensive computer controls of projects. Standard logic voltages are notably harmless: five volts (roughly the same as two run-down flashlight batteries), and ground- zero volts.
Some examples of parallel ports:
- IEEE 1284 is the IEEE standard for the common PC printer port.
- 8255 for Intel microprocessors
- Z80PIO for Zilog microprocessors
http://www.fapo.com/porthist.htm - Warp Nine Engineering: history of the parallel port This is an Article on Parallel port. Page Contains Information, Facts Details or Explanation Guide About Parallel port References