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A laser printer works like a photocopy machine. The main difference is that, while a photocopier creates a copy of a real image (the paper original), a laser printer makes a copy of a digital computer image. When data arrives at the printer from the computer, the encoded image is stored in the printer s memory. The memory stores one page of data, and then sends it along to the laser and other devices. Some printers use a light-emitting-diode (LED) matrix, rather than a single laser. These printers are called LED printers. For practical purposes, LED printers are equivalent to laser printers.
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The modem 635 The laser blinks rapidly while it scans a cylindrical drum. The drum has special properties that cause it to attract the printing chemical, called toner, in some places but not others, creating an image pattern that will ultimately appear on the paper. A sheet of paper is pulled past the drum and also past an electrostatic charger. Toner from the drum is attracted to the paper. The image thus goes onto the paper, although it has not yet been permanently fused, or bonded, to the paper. The fuser, a hot pair of roller/squeezers, does this job, completing the printing process. The main asset of laser printers is their excellent print and graphics quality. The image resolution of a laser printer ranges from about 300 dots per inch (DPI) for older units to 1200, 2400, or even more DPI in state-of-the-art machines. As far as the untrained eye can tell, 600 DPI is as good as a photograph. Laser printers can handle graphics and text equally well. If an image can be rendered on a photocopy machine, it can be rendered just as well on a laser printer. Another asset of laser printers is that they make almost no noise. Yet another good feature is that this type of printer is relatively fast. The best highend machines can produce a couple of dozen copies per minute. The laser printer is the best device for rendering high-resolution hard copy text and graphics. If you re doing desktop publishing, presentation graphics, or anything else that requires top-grade or high-volume hard copy, you ll want a laser printer. Ask some friends for their opinions, and if printing is really important to you, don t cut corners. A good laser printer is the geek s equivalent of a reliable truck.
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The modem
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The term modem is a contraction of modulator/demodulator. A modem interfaces a computer to a telephone line, television cable system, fiber-optic network, or radio transceiver, allowing you to communicate with other computer users and to surf the Internet.
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An external modem is a self-contained unit (box) that you can use with any computer. It has a cord that runs to the computer s serial data port (also called the communications port) and another cord that runs to the telephone jack. The modem will probably also have a jack into which you can plug your phone set. An internal modem is a printed-circuit board, also called a card, that is commonly installed in new computers. Virtually all desktop computers come with modems. A new notebook computer might not have an internal modem installed; in that case you can purchase one in the form of a PC card that fits into a slot on the side of the computer. This card is roughly the height and width of a credit card, but somewhat thicker.
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A computer works with binary digital signals, which are rapidly fluctuating direct currents. For digital data to be conveyed over a telephone or radio circuit, the data must be converted to analog form. In a telephone modem or radio-transceiver modem, this is done by changing the digit 1 into an audio tone, and the digit 0 into another tone with a different pitch. The result is an extremely fast back-and-forth
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636 Computers and the Internet alternation between the two tones. In modulation, digital data is changed into analog data. It is a type of digital-to-analog (D/A) conversion. Demodulation changes the analog signals back to digital ones; this is analog-to-digital (A/D) conversion. If you happen to pick up a telephone extension while someone is on-line with the computer from another extension, you ll hear the analog signals from the two modems; it sounds like a hiss or roar. But don t make a habit of doing this. It can cause the computer to be disconnected from the on-line network.
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