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ITU T.50 ITU-T recommendation T.50 specifies the International Reference Alphabet (IRA, formerly International Alphabet No. 5, IA5), a character set encoding. ASCII is the U.S. variant of that character set. The original version from November 1988 corresponds to ISO 646. The current version is from September 1992. ==History== At the beginning was the International Telegraph Alphabet No. 2#ITA2, a five bits code. IA5 is an improvement based on seven bits bytes. International Telegraph Alphabet No. 2#ITA2 *5 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「ITU T.50」の詳細全文を読む
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