Six-bit character code: Difference between revisions

Revision as of 19:08, 22 February 2025

Revision as of 07:02, 23 February 2025

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==={{anchor|ECMA-1}}ECMA and ISO six-bit code===

A six-bit code similar to DEC's, but replacing a few punctuation characters with the most useful control characters—including [[Shift Out and Shift In characters|SO/SI]], allowing code extension—was specified as [[Ecma International|ECMA]]-[https://ecma-international.org/publications-and-standards/standards/ecma-1/ 1] in 1963 (see [[#ASCII-variants|below]]). Four years later, ISO Recommendation R 646-1967 (which later evolved into [[ISO/IEC_646 | ISO Standard 646]]) included an almost identical six-bit code, differing only in some of the alternative options permitted for a few characters. ECMA-1 was eventually withdrawn, and ISO 646-1973 explicitly removed the six-bit code, standardizing only its ubiquitous 7-bit code.

===FIELDATA six-bit code===

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{{notelist|refs=

{{efn|name=crlf|In systems where LF both advances to the next line and returns the carriage to the start position, CR may instead be used as a "spare control" according to ECMA-1, and as BS "backspace" according to ISO/R 646. LF then has the designation NL "new line".}}

{{efn|name=natopt|These characters are intended for nationalizationnational use. Where the local alphabet contains letters additional to the basic latin alphabet, they should be assigned to these character positions. The default assignments, according to ECMA-1, are listed here.}}

}}