KOI-7

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KOI-7 (Russian: Код Обмена Информацией, 7 бит, romanized: Kod Obmena Informatsiey, 7 bit, КОИ-7) is a 7-bit character encoding, designed to cover Russian, which uses the Cyrillic alphabet. It was first standardized in GOST 13052-67 (with the 2nd revision GOST 13052-74 / ST SEV 356-76) and GOST 27463-87 / ST SEV 356-86. Shift Out (SO) and Shift In (SI) control characters are used in KOI-7, where SO starts printing Russian letters (KOI-7 N1), and SI starts printing Latin letters again (KOI-7 N0), or for lowercase and uppercase switching. This version is also known as KOI7-switched aka csKOI7switched. On ISO 2022 compatible computer terminals KOI7-switched can be activated by the escape sequence ESC ( @ ESC ) N LS0. KOI-7 was used on machines like the SM EVM (СМ ЭВМ) and DVK (ДВК); KOI-7 N2 was utilized in the machine-language of the Elektronika D3-28 as four-digit hexadecimal code, BESM-6, where it was called ВКД, (internal data code). The encodings were also used on RSX-11, RT-11 and similar systems.