KOI-7
| Kermit | SHORT-KOI |
|---|---|
| Alias(es) | KOI-7 N2, ВКД |
| Language(s) | Russian |
| Standard | GOST 13052, GOST 27463 |
| Classification | 7-bit KOI encoding |
| Preceded by | MTK-2 |
| Succeeded by | KOI-8 |
| Other related encoding(s) | YUSCII, ISO 646 |
| MIME / IANA | KOI7-switched |
|---|---|
| Alias(es) | csKOI7switched |
| Language(s) | Russian |
| Standard | GOST 13052, GOST 27463 |
| Classification | 7-bit stateful KOI encoding |
| Transforms / Encodes | ISO 646:IRV (shift-in) KOI-7 N1 (shift-out) |
| Preceded by | MTK-2 |
| Succeeded by | KOI-8 |
| Other related encoding(s) | YUSCII, ISO 5427 |
KOI-7 (КОИ-7) is a 7-bit character encoding, designed to cover Russian, which uses the Cyrillic alphabet.
In Russian, KOI-7 stands for Kod Obmena Informatsiey, 7 bit (Код Обмена Информацией, 7 бит) which means "Code for Information Exchange, 7 bit".
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 Электроника Д3-28 (Elektronika D3-28) as four-digit hexadecimal code, БЭСМ-6 (BESM-6), where it was called ВКД, (internal data code). The encodings were also used on RSX-11, RT-11 and similar systems.