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	Parallel port - Wikipedia, the free encyclopedia
		Over a parallel port, binary information is transferred in parallel: each bit in a particular value is sent simultaneously as an electrical pulse across a separate wire (see parallel communications), in contrast to a serial port, which requires each bit to be sent in series over a single wire.
		Parallel ports are most often used by microprocessors to communicate with peripheral devices.
		However, when people refer to a parallel port, they are usually referring to a printer port, either on a printer or a PC.
	en.wikipedia.org /wiki/Parallel_port (616 words)

	Warp Nine Engineering - The IEEE 1284 Experts - Parallel Port Background (Site not responding. Last check: 2007-10-22)
		The parallel port had the capability to transfer 8 bits of data at time whereas the serial port transmitted one bit at a time.
		These ports are commonly referred to as the LPT ports and have the familiar I/O base addresses of 3BCh, 378h and 278h.
		Newer implementations of the parallel port, that support the advanced modes of the 1284 standard, use 8 to 16 registers and are located at I/O addresses 378h or 278h, or are re-locatable, as in the case of a Plug and Play compliant parallel adapter.
	www.fapo.com /porthist.htm (1092 words)

	Parallel Port Configuration
		Parallel port is a simple and inexpensive tool for building computer controlled devices and projects.
		The parallel port is often used in Computer controlled robots, Atmel/PIC programmers, home automation,...etc. The primary use of parallel port is to connect printers to computer and is specifically designed for this purpose.
		Thus it is often called as printer Port or Centronics port (this name came from a popular printer manufacturing company 'Centronics' who devised some standards for parallel port).
	www.geocities.com /nozomsite/parallel.htm (453 words)

	Information and help with the computer parallel port
		The standard length of Printer Parallel cables is a maximum of 15 feet; although there are 50 foot cables, it is not recommended that these cables be used as it can create poor connection and data signals.
		Bi-directional - 8-bit standard port which was released with the introduction of the PS/2 port in 1987 by IBM and are still found in computers today.
		Parallel scanners are a popular alternative to SCSI scanners because of how easy they are to to install.
	www.computerhope.com /help/parallel.htm (528 words)

	Parallel Port Explained
		Parallel data transfer was largely performed by software in SPP and BPP systems, and thus data transfer rates were limited to 150 KBps in the forward direction (compatibility or "Centronics" mode) and 50 KBps in the reverse direction (nibble and byte modes).
		In SPP and BPP systems, data is placed on the port's data lines, the printer status is checked for no errors and that it is not busy, then a data strobe is generated by the software to clock the data to the printer.
		In the Parallel Port Data FIFO Mode, data written or DMAed to a 16-byte FIFO is automatically transferred to a peripheral using standard parallel port protocol.
	www.bb-elec.com /tech_articles/parallel_port_explained.asp (1533 words)

	Parellel port output
		If the parallel port is integrated to the motherboard (like in many new computers) repairing damaged parallel port may be expensive (in many cases it it is cheaper to replace the whole motherborard than repair that port).
		In simplest case the parallel port data pins state mght be random in the beginning, and quicly set to all at logic 0 state.
		This parallel port type also implemented the same three registers as used by SPP for the control and monitoring of the data and handshaking lines; these are the data port, status port, and control port.
	www.epanorama.net /circuits/parallel_output.html (16202 words)

	Interfacing the Standard Parallel Port
		However the Control Port must be set to xxxx0100 to be able to read data, that is all pins to be +5v at the port so that you can pull it down to GND (logic 0).
		The Y outputs are connected up to the Parallel Port's status port, in such a manner that it represents the MSnibble of the status register.
		We are now in a position to write 0x00 to the data port, which causes a high to low transition on the Parallel Port's Acknowledge line as it's connected to one of the data lines.
	www.beyondlogic.org /spp/parallel.htm (5394 words)

	Howstuffworks "How Parallel Ports Work"
		While USB is becoming increasingly popular, the parallel port is still a commonly used interface for printers.
		Parallel ports can be used to connect a host of popular computer peripherals:
		In this article, you will learn why it is called the parallel port, what it does and exactly how it operates.
	computer.howstuffworks.com /parallel-port.htm (157 words)

	Introduction
		In the moment that the parallel port was presented, the matrix printers were the main device external that you could connects.
		During the outburst, the BIOS checks if there is parallel ports in the addresses base 3BCh, 378h, and 278h, in that order, and it stores the address bases of any that you/they have been found in serial positions of the chart.
		The parallel port can be used as a direct communication with the PC, this way it is possible to develop applications in time - real that need a quick time of answer.
	www.galeon.com /jcgr (2055 words)

	PARALLEL PORT INTERFACING TUTORIAL - Logix4u
		Everybody knows what is parallel port, where it can be found, and for what it is being used.
		the primary use of parallel port is to connect printers to computer and is specifically designed for this purpose.
		Here 888(0x378) is the address of the parallel port data register and 255 is the data to be written to parallel port data register.
	www.logix4u.net /parallelport1.htm (1013 words)

	The PC's Parallel Port
		Jan's Parallel Port FAQ has answers to frequently asked questions about using, interfacing, and programming the parallel port in all of its modes.
		Parallel Port Development Kits are available as well.
		There are various ways for applications to access the parallel port and other I/O ports in PCs, including directly accessing port addresses, communicating with a driver that accessing port addresses and using Windows' built-in drivers.
	www.lvr.com /parport.htm (2290 words)

	Parallel port
		The parallel port, found on the back of IBM compatible computers, is a 25-pin (Type DB-25) computer interface commonly used to connect printers to the computer; below is an example of the DB25 interface.
		The interface found on the back of parallel interfaces is commonly a 36-pin male / female connector that is held in place with levers on each side of the cable.
		The Apple Macintosh computers use SCSI as its interface, which is parallel, but a lot more flexible when compared to the parallel port.
	www.computerhope.com /jargon/p/paraport.htm (134 words)

	Interfacing the IBM PC Parallel Printer Port
		This port uses a female DB-25S connector on the computer, and a special male DB-25P to Centronics male 36 pin "IBM Printer cable" is used to connect to standard Centronics parallel printers.
		When bit C5 is 0, the Data Out port operates as it did for earlier parallel ports (driver enabled); when C5 is set to 1, though, the Data Out port is tristated, which means that it is essentially electically disconnected from the pins (high impedance state), not driving them high nor low.
		Note that all recent parallel ports are implemented with single chip LSI controllers rather than the MSI TTL originals, which means that they may have different drive capacities, electical margins, and replacement costs, should you attempt this approach.
	www.ee.washington.edu /circuit_archive/text/para-port.html (4986 words)

	parallel port - Glossary - CNET.com (Site not responding. Last check: 2007-10-22)
		Look on the back of any PC and you'll see a 25-pin RS-232C connector, better known as a parallel port.
		Theoretically eight times faster than serial ports, parallel ports are also called the printer ports, since that's what you usually find attached to them (although you can get tape backup units, CD-ROM drives, scanners, and other devices in parallel port format these days).
		For example, 4-bit ports output 8 bits of data at a time but receive only 4 bits, while 8-bit ports handle 8 bits of data both ways.
	www.cnet.com /Resources/Info/Glossary/Terms/parallelport.html (105 words)

	Parallel Port Complete, Programming, Interfacing, and Using the PC's Parallel Printer Port, by Jan Axelson
		Anyone designing hardware to work with a parallel port is well advised to add this book to their library.
		But you can use the parallel port for much more than this, including interfacing to control circuits, data-acquisition devices, and instrumentation.
		Parallel Port Complete is a complete guide to using and programming the PC's parallel port.
	www.lvr.com /parprtib.htm (582 words)

	Parallel Port Programming
		Three output bits on the control por t and one input on the status port are inverted by the hardware.
		We have to force all the four outputs on the lower nibble of the control port to logic one.
		Now usually when sending data to the parallel port you need a slight delay to ensure that the data has been sent, and not lost.
	www.gmonline.demon.co.uk /cscene/CS4/CS4-02.html (975 words)

	Programming The Parallel Port In QBasic
		The parallel port is made up of three different sections.
		Anyway, you operate the port by sending it a number that represents the binary pattern of the physical outputs on the port.
		This has the effect of keeping all previous bits at the same state they were in, but either turning on or off the bit or bits represented by the number we pass to the sub.
	www.aaroncake.net /electronics/qblpt.htm (1355 words)

	Interfacing the Parallel Port
		EPP Ports were first specified in the EPP 1.7 standard, and then later included in the IEEE 1284 Standard released in 1994.
		When a read cycle is performed, the port must undertake the appropriate Read/Write handshake and return the data in that ISA cycle.
		The Parallel Port can only transport 8 bits at a time, thus any 32 or 16 bit word written to the Parallel Port will be split into byte size blocks and sent via the Parallel Port's 8 data lines.
	www.beyondlogic.org /epp/epp.htm (1220 words)

	Linux: parport (Site not responding. Last check: 2007-10-22)
		There are now quite a lot of devices that plug into the parallel port of a computer and provide a "through-port" which another parallel port device can be plugged into, for example the IOMega ZIP drive and the MicroSolutions "backpack" CD-ROM drive.
		The Linux parallel port sharing code acts as a resource manager for the parallel port, so that the different device-drivers needed for the devices connected to the parallel port can co-operate.
		The IEEE standards 1284.x are relevant to parallel port communications.
	people.redhat.com /twaugh/parport (497 words)

	How To Build Parallel Port Prototypes \| Hardware Secrets
		The computer parallel port is the easiest way to control devices outside the PC, like LEDs, lights and even home appliances.
		Thus, on the majority of modern PCs the parallel is not used, so it is available for us to use it to control circuits outside the computer box.
		But for “heavier” circuits like lights and home appliances, you will need to build a power circuit, because the computer parallel port is not capable of driving enough current to deal with such devices.
	www.hardwaresecrets.com /article/233 (453 words)

	Linux Parallel Port Home Page
		Many external peripheral devices are available in versions that connect to a personal computer's parallel printer port.
		If you have a parallel port peripheral and would like to see if a Linux driver is available, this is the place to look.
		The following is a list, arranged in alphabetical order by manufacturer, of most of the parallel port devices for which Linux support is available or in development.
	cyberelk.net /tim/parport/parport.html (349 words)

	Warp Nine Engineering - The IEEE 1284 Experts - IEEE 1284 (Site not responding. Last check: 2007-10-22)
		This page is an entry point for information regarding the IEEE 1284 Parallel Port Standard.
		This section has the latest information on related developments in the parallel port standards area.
		Please note that this is NOT the ECP standard, but Microsoft's' register model implementation for a ECP Parallel Port on a PC.
	www.fapo.com /ieee1284.htm (269 words)

	Parallel Printer Port Access through Java
		ParallelPort is a simple Java class that enables you to read and write bytes to and from the parallel ports on your computer.
		I have programmed parport to be able to access the parallel port on my computer.
		Currently, the midi channel is the same as the port number on the xobsen.
	www.geocities.com /Juanga69/parport (515 words)

	Interfacing to the IBM-PC Parallel Printer Port (Site not responding. Last check: 2007-10-22)
		Reading and Writing Data • How many ports are present and where
		Kris Heidenstrom's PC Parallel Port Mini-FAQ covers the essentials of standard and bidirectional PC parallel ports.
		Beyond Logic covers both Parallel and Serial Ports and more...
	www.doc.ic.ac.uk /~ih/doc/par (193 words)

	Parallel Port Relay Board
		Then you can convert it into a dedicated controller.
		Communicate with the real world via the parallel printer port on your PC.
		Simply connect printer cable from your computer to the connector on relay board.
	electronickits.com /kit/complete/elec/ck1601.htm (275 words)

	Linux Parallel Port Home Page
		Links to the homepages of some Linux parallel port driver projects:
		Special thanks go to these companies for equipment donations:
		This page last modified Sunday, 2 January 2000
	www.torque.net /linux-pp.html (460 words)

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