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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.
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.
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 Tactile print for blind persons JIS X 0201: 1969 6/7 bits First Japanese electronic character set ECMA-48: 1972 7 bits
Various proprietary modifications and extensions of ASCII appeared on non-EBCDIC mainframe computers and minicomputers, especially in universities.Hewlett-Packard started to add European characters to their extended 7-bit / 8-bit ASCII character set HP Roman Extension around 1978/1979 for use with their workstations, terminals and printers.
When there are 7 spare bits in the last octet of a message, these bits are set to the 7-bit code of the CR control (also used as a padding filler) instead of being set to zero (where they would be confused with the 7-bit code of an '@' character). This 7-bit encoding allows the transport of texts consisting of printable characters from Basic ...
The 7-bit ASCII character set became the industry standard method for encoding alphanumeric characters for teletype machines and computer terminals. The extra bit was used for parity, to ensure the integrity of data storage and transmission. As a result, the 8-bit byte became the de facto datatype for computer systems storing ASCII characters ...
ASCII is a 7-bit standard, allowing a total of 128 characters in the character set. Some of these are reserved as control characters, leaving 96 printable characters.This set of 96 printable characters includes upper and lower case letters, numbers, and basic math and punctuation.
UTF-7 (7-bit Unicode Transformation Format) is an obsolete variable-length character encoding for representing Unicode text using a stream of ASCII characters. It was originally intended to provide a means of encoding Unicode text for use in Internet E-mail messages that was more efficient than the combination of UTF-8 with quoted-printable.