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ASCII (/ ˈ æ s k iː / ⓘ ASS-kee), [3]: 6 an acronym for American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment , and other devices.
Some older and today uncommon formats include BOO, BTOA, and USR encoding. Most of these encodings generate text containing only a subset of all ASCII printable characters: for example, the base64 encoding generates text that only contains upper case and lower case letters, (A–Z, a–z), numerals (0–9), and the "+", "/", and "=" symbols.
Code page 437 (CCSID 437) is the character set of the original IBM PC (personal computer). [2] It is also known as CP437, OEM-US, OEM 437, [3] PC-8, [4] or MS-DOS Latin US. [5] The set includes all printable ASCII characters as well as some accented letters (), Greek letters, icons, and line-drawing symbols.
Punched tape with the word "Wikipedia" encoded in ASCII.Presence and absence of a hole represents 1 and 0, respectively; for example, W is encoded as 1010111.. Character encoding is the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using computers. [1]
The block contains all the letters and control codes of the ASCII encoding. It ranges from U+0000 to U+007F, contains 128 characters and includes the C0 controls , ASCII punctuation and symbols , ASCII digits , both the uppercase and lowercase of the English alphabet and a control character .
The majority of code pages in current use are supersets of ASCII, a 7-bit code representing 128 control codes and printable characters.In the distant past, 8-bit implementations of the ASCII code set the top bit to zero or used it as a parity bit in network data transmissions.
The 8-bit encodings KOI8-R and KOI8-U, IBM-866, and also Windows-1251 are far more commonly used. In contrast to the relationship between Windows-1252 and ISO 8859-1, Windows-1251 is not closely related to ISO 8859-5. However, the main Cyrillic block in Unicode uses a layout based on ISO-8859-5.
Python, for example, uses the label MS-Kanji (or cp932) for Windows-932 and the label Shift_JIS (or sjis) for JIS X 0208-defined Shift JIS, without recognising the Windows-31J label. [ 12 ] In Japanese editions of Windows, this code page is referred to as "ANSI" , since it is the operating system's default 8-bit encoding, even though ANSI was ...