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7 bits ASCII localization ISO 646: 1967 (ISO/R646-1967) [3] 7 bits ASCII localization ASCII: 1967 (USAS X3.4-1967) [3] [7] [6] 7 bits Close to "modern" definition of ASCII Transcode: 1967 7 bits IBM data transmission terminal 2780, 3780: Recommendation V.3 IA5: 1968 7 bits MARC-8: 1968 7 bits Library computer systems Braille ASCII: 1969 6/7 bits
ASCII was incorporated into the Unicode (1991) character set as the first 128 symbols, so the 7-bit ASCII characters have the same numeric codes in both sets. This allows UTF-8 to be backward compatible with 7-bit ASCII, as a UTF-8 file containing only ASCII characters is identical to an ASCII file containing the same sequence of characters.
ISO/IEC 646 is a set of ISO/IEC standards, described as Information technology — ISO 7-bit coded character set for information interchange, and developed in cooperation with ASCII at least since 1964. [1] [2] Since its first edition in 1967 [3] it has specified a 7-bit character code from which several national standards are derived.
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 DOS Latin US. [5] The set includes all printable ASCII characters as well as some accented letters (), Greek letters, icons, and line-drawing symbols.
It contains standard 7-bit ASCII codes, and Japanese characters are indicated by the high bit of the first byte being set to 1. Some code points in this page require a second byte, so characters use either 8 or 16 bits for encoding.
Seven-bit ASCII improved over prior five- and six-bit codes. Of the 2 7 =128 codes, 33 were used for controls, and 95 carefully selected printable characters (94 glyphs and one space), which include the English alphabet (uppercase and lowercase), digits, and 31 punctuation marks and symbols: all of the symbols on a standard US typewriter plus a ...
Code 127 (DEL, a.k.a. "rubout") is likewise a special case. Its 7-bit code is all-bits-on in binary, which essentially erased a character cell on a paper tape when overpunched. Paper tape was a common storage medium when ASCII was developed, with a computing history dating back to WWII code breaking equipment at Biuro Szyfrów. Paper tape ...
In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...