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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 ECMA-1 was eventually withdrawn, and ISO 646-1973 explicitly removed the six-bit code,
===FIELDATA six-bit code===
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