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alphanumeric
Book article from: The Columbia Encyclopedia, Sixth Edition
alphanumeric or alphameric , the set of letters and numbers. When used in reference...the phrase "alphabetic characters" means only English letters, an alphanumeric character set may also include letters from other languages that also...
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optical character recognition
Book article from: The Columbia Encyclopedia, Sixth Edition
...for less than perfect and uniform text. OCR is also used to produce text files from computer files that contain images of alphanumeric characters, such as those produced by fax transmissions. See also computer graphics ; pen-based computer ; personal digital...
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computer
Book article from: The Columbia Encyclopedia, Sixth Edition
...the eight-bit byte permits 256 different "on-off" combinations. Each byte can thus represent one of up to 256 alphanumeric characters, and such an arrangement is called a "single-byte character set" (SBCS); the de facto standard for this...
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Cipher Machines
Encyclopedia entry from: Encyclopedia of Espionage, Intelligence, and Security
...embedded wires connecting one side to the other. Matching points on opposite surfaces of the disk correspond to the same alphanumeric characters, and each wire running through the disk corresponds to one character to be enciphered or deciphered. By connecting...
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Civil War, Espionage and Intelligence
Encyclopedia entry from: Encyclopedia of Espionage, Intelligence, and Security
...or memorized verbal messages through the lines. Both sides developed methods to encrypt messages using various forms of alphanumeric sequence codes and cipher wheels. The telegraph was the leading communication technology of the period. Anyone with a portable...
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ASCII
Book article from: Concise Oxford Companion to the English Language
...characters (such as ‘start of text’ and ‘carriage return’) and 96 displayed alphanumeric and other characters, every letter or other symbol having a number from 0 to 128: for example, 33 for ! , 36 for $ , 65...
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videotex
Book article from: The Columbia Encyclopedia, Sixth Edition
...computer by telephone lines, cable television facilities, or the like, and that allows a user to retrieve and display alphanumeric and pictorial information at home. Traditional videotex systems are limited to menu-oriented applications, in which information...
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computer terminal
Book article from: The Columbia Encyclopedia, Sixth Edition
...handle. For example, a simple early terminal comprised a typewriter keyboard for input and a typewriter printing element for alphanumeric output. A more recent variation includes the keyboard for input and a televisionlike screen to display the output. The...
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American Standard Code for Information Interchange
Encyclopedia entry from: The Gale Encyclopedia of Science
...binary code). There were as a result 128 possible ways of arranging these 0s and 1s. In this representation, each alphanumeric character was uniquely assigned a number between 0 and 127, which was represented by its binary equivalent in a string of...
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Personal Digital Assistant
Encyclopedia entry from: The Gale Encyclopedia of Science
...considered a PDA because it offers only one type of function, numerical calculation, and does not allow for the input of alphanumeric information (words as well as numbers). Within a few years of the appearance of the calculator, engineers with several...
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