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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.
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 ...
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 ...
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
[12]: 13.1 The escape sequences consist only of bytes in the range 0x20—0x7F (all the non-control ASCII characters), and can be parsed without looking ahead. The behavior when a control character, a byte with the high bit set, or a byte that is not part of any valid sequence, is encountered before the end is undefined.
In the ASCII standard, the numbers 0-31 and 127 are assigned to control characters, for instance, code point 7 is typed by Ctrl+G. While some (most?) applications would insert a bullet character • (code point 7 on code page 437), some would treat this identical to Ctrl+G which often was a command for the program. [citation needed]
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.
Examples of seven-bit binary codes are: International Telegraph Alphabet No. 3 – derived from the Moore ARQ code, and also known as the RCA; ASCII – The ubiquitous ASCII code was originally defined as a seven-bit character set. The ASCII article provides a detailed set of equivalent standards and variants.