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Acronym for modulator/demodulator. The device that lets a computer transmit and receive information over telephone lines by converting digital data from computers into analog data that can be transmitted over phone lines. The opposite process takes place on the receiving end. Modems are the primary way most computer users connect to outside networks such as the Internet.
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A power device is a discrete semiconductor component which is used to control current in electric motors, electronic equipment and cars, and increasingly to regulate and save power in consumer electronic equipment, such as portable appliances.
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A printer outputs data that is seen on the computer screen. Most printers are used through a parallel port, but some newer ones use USB connections. USB is somewhat faster, but there's not much of a difference for printers. Networked computers usually print to a printer through the network card. The most crucial printer measurement is its dots per inch rating. Although this can be misleading, a higher number is generally better. Printers are best chosen by actually seeing the quality of the printer output.
A device for printing results from your computer on paper or other "hard" media. While there are many kinds of printers, most these days fall into two groups. Inkjet printers use a technique to "spray" the ink onto your paper. Practically all inkjet printers these days can print in color, and can print from 2 to 12 pages per minute. Laser printers use a combination of copier technology tied with a laser to essentially "copy" the image onto the paper. While color laser printers are available, they are expensive. Laser printers can print from 15 to 50 pages per minute
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Rack Units, Shelves and related Accessories
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An input device for a computer that digitizes a photograph or other optical image into a binary representation. A scanner may be linked to optical character recognition software allowing printed documents to be converted directly to machine-readable text files. This device allows you to read images and text into your computer. Scanners use a variety of connection formats including Parallel Port, USB, and SCSI. USB is simple, SCSI is fast, and Parallel Port is extremely slow.
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