3/10/2024 0 Comments Ascii character sets art![]() ![]() ASCII was originally developed for communications and uses seven bits per character, providing 128 combinations that include upper and lower case alphabetic letters, the numeric digits and special symbols such as the $ and %. This article is provided by FOLDOC - Free Online Dictionary of Computing ( ) ASCII( American Standard Code for Information Interchange) Pronounced " ask-ee," ASCII is the built-in binary code for representing characters in all computers except IBM mainframes, which use EBCDIC coding. See also ASCII character table, Yu-Shiang Whole Fish. Mangle text with byte values above 127, as some older systems National character sets ended up being a prime justificationįor Unicode, which was designed, ostensibly, to be the *one*Ī system is described as " eight-bit clean" if it doesn't This basic problem with having a multiplicity of Language encodable with the common subset of all the ASCIIĭialects. To all those in use, and therefore to stick to English as the The URL standard) to stick to US-ASCII as a subset common Proliferating sets of national characters produced anĮvolutionary pressure (especially in protocol design, e.g., Perversely, though, efforts to solve this problem by Want to use a character set suited to their own languages. That words of text consist entirely of byte values 65-90 andĩ7-122 (A-Z and a-z) this is a major irritant to people who Hardware and software from the US still tends to embody theĪssumption that US-ASCII is the universal character set and National extensions to US-ASCII were developed, such as Rule rather than the exception (see software rot). Misfeature as computer use outside the US and UK became the Language other than English became an obvious and intolerable The inability of US-ASCII to correctly represent nearly any World, ">" at Texas Instruments, and "&" on the BBC Micro,Īcorn Archimedes, Sinclair, and some Zilog Z80 "#" in many assembler-programming cultures, "$" in the 6502 In different communities because various assemblers use themĪs a prefix tag for hexadecimal constants (in particular, ">", and "&" characters, for example, are all pronounced "hex" Some other common usages cause odd overlaps. Single quote, space, tilde, underscore, vertical bar, zero. Percent, plus, question mark, right brace, right brace, right bracket, right parenthesis, semicolon, Less than, minus, parentheses, oblique stroke, Greater than, hash, left bracket, left parenthesis, See V ampersand, asterisk, back quote, backslash,Ĭaret, colon, comma, commercial at, control-C,ĭollar, dot, double quote, equals, exclamation mark, Their official ITU-T names and the particularly silly names Pronunciation guide in rough order of popularity, including Individual characters are listed in this dictionary withĪlternative names from revision 2.3 of the Usenet ASCII Every character has one or more names - some Hackers need to be very precise when talking about characters,Īnd have developed a considerable amount of verbal shorthandįor them. Such as EBCDIC and Baudot, which used fewer bytes, butĬomputers are much pickier about spelling than humans thus, Non-Latin writing systems (e.g., Cyrillic, or Han characters), and such desirable glyphs as distinct open-Īnd close-quotation marks. Latin-1, Unicode) define extensions to ASCII for valuesĪbove 127 for conveying special Latin characters (likeĪccented characters, or German ess-tsett), characters from Space, numbers, most basic punctuation, and unaccented lettersĪ-z and A-Z. (character points 0 to 127) to convey some control codes, The basis of character sets used in almost all present-dayĬomputers. This in turn led to the standardization of 16-bit (or “double-byte”) and 32-byte character sets, such as Unicode, that could accommodate large numbers of linguistic and other symbols. As a consequence, national extensions to US-ASCII were developed that were incompatible with one another. However, the inability of US-ASCII to correctly represent many other languages became an obvious and intolerable misfeature as computer use outside the United States and United Kingdom increased. This IBM-extended ASCII set has become a de facto standard. ![]() ![]() With the introduction of its personal computer in 1981, the International Business Machines Company (IBM) increased the number of available characters to 256 by using an eight-bit byte. Thus, in decimal equivalents, the series “72, 69, 76, 76, 79” represents the letters “h, e, l, l, o” in ASCII. A seven-digit (or seven-bit) binary number (see binary system) can represent one of 128 distinct codes. ![]() Originally designed for teletype operations, it has found wide application in computers. ASCII or American Standard Code for Information Interchange, a set of codes used to represent letters, numbers, a few symbols, and control characters. ![]()
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