ISO 646 SERIES TO TEXT CONVERTER CODE
Since code 0 was ignored, it was possible to leave gaps (hole regions) and later make corrections. Although this function resembles other control characters, the ASCII designers devised this code to be able to “erase” a section of the perforated paper (a popular storage medium until the 1980s) by punching all possible holes in a specific character position, replacing any previous information. The ASCII code reserves the first 32 codes (numbered 0 through 31 in decimal) for control characters – codes not originally intended to represent printable information, but to control devices (such as printers ) that used ASCII. For example, character 10 represents the “line feed” function, which makes a printer feed the paper, and character 27 represents the “escape” key often found in the upper left corner of keyboards. common.Ĭode 127 (all seven bits to one), another special character, is equivalent to “delete”. In addition to reserving a few control codes for the word processor, and does not define any mechanism to describe the structure or appearance of the text in a document these matters are specified by other languages such as tag languages. ASCII code defines a relationship between specific characters and sequences of bits Machines that did not use parity checking would set the eighth bit to zero in most cases, although other systems such as Prime computers, which executed PRIMOS set the eighth bit of the ASCII code to one. The most appropriate name for this character code is “US-ASCII”.ĪSCII is strictly a seven-bit code, which means that it uses representable bit strings with seven binary digits (ranging from 0 to 127 in decimal base) to represent character information.Īt the time the ASCII code was introduced, many computers worked with groups of eight bits ( bytes or octets ), as the minimum unit of information where the eighth bit was commonly used as a parity bit with error control functions on communication lines or other device-specific functions.
The character code ASCII -or a compatible extension (see below) – is used in almost all computers, especially personal computers, and workstations. Computers only understand numbers. ASCII code is a numeric representation of a character such as ‘a’ or other character representation format codes, ASCII is a method for correspondence between bit strings and a series of symbols (alphanumeric and others), thus allowing communication between digital devices as well as processing and storage.
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