KOI-8

KOI-8 (КОИ-8) is an 8-bit character set standardized in GOST 19768-74.[1][2] It is an extension of KOI-7 which allows the use of the Latin alphabet along with the Russian alphabet, both the upper and lower case letters; however, the letter Ёё and the uppercase Ъ are missed, the latter to avoid conflicts with the delete character (both are added in most extensions, see KOI8-B). The first 127 code points are identical to ASCII with the exception of the dollar sign $ (code point 24hex) replaced by the universal currency sign ¤. The rows x8_ and x9_ (code points 128–159) might be filled with the additional control characters from EBCDIC (code points 32–63).

This article is about KOI-8, defined by GOST 19768-74. For the misnomered "KOI-8 N1" and "KOI-8 N2" encodings defined by GOST R 34.303-92, see Code page 866 § GOST R 34.303-92.
"GOST 19768" redirects here. For the later 1987 encoding sometimes cited as such, labelled "GOST_19768-74" by the IANA, and also dubbed "KOI-8 V1" by GOST R 34.303-92, see ISO-IR-153.
KOI-8
Language(s)Russian (basic support)
StandardGOST 19768-74
ClassificationExtended ISO 646, KOI
ExtensionsKOI8-B (KOI8-R, KOI8-U, KOI8-RU, KOI8-T, ISO-IR-111, KOI8-F)
Transforms / EncodesISO 646:IRV (lower)
KOI-7 N1 (upper)
Preceded byKOI-7
Succeeded byST SEV 358-88 (ISO-IR-153)
Other related encoding(s)INIS Cyrillic

This standard has become the base for the later Internet standards such as KOI8-R, KOI8-U, KOI8-RU and all the other derivatives.

Unicode is preferred to KOI-8 and its variants or other Cyrillic encodings in modern applications, especially on the Internet, making UTF-8 the dominant encoding for web pages. (For further discussion of Unicode's complete coverage, of 436 Cyrillic letters/code points, including for Old Cyrillic, and how single-byte character encodings, such as Windows-1251 and KOI8 variants, cannot provide this, see Cyrillic script in Unicode.)

Character set

The following table shows the KOI-8 encoding. Each character is shown with its equivalent Unicode code point.

KOI-8[3]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0x NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI
1x DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US
2x  SP  ! " # ¤/$[lower-alpha 1] % & ' ( ) * + , - . /
3x 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
4x @ A B C D E F G H I J K L M N O
5x P Q R S T U V W X Y Z [ \ ] ^ _
6x ` a b c d e f g h i j k l m n o
7x p q r s t u v w x y z { | } ~ DEL
8x
9x
Ax
Bx
Cx ю а б ц д е ф г х и й к л м н о
Dx п я р с т у ж в ь ы з ш э щ ч ъ
Ex Ю А Б Ц Д Е Ф Г Х И Й К Л М Н О
Fx П Я Р С Т У Ж В Ь Ы З Ш Э Щ Ч

See also

Footnotes
  1. Originally given as an international currency sign to match the ISO 646 IRV, which has itself since been changed to match ASCII in giving it as a dollar sign. KOI-8 variants and extensions in use tend to match ASCII here, see for example RFC 2319.

References
  1. (in Russian) ГОСТ 19768-74 (СТ СЭВ 358-76). Машины вычислительные и система обработки данных. Коды 8-битные для обмена и обработки информации.
  2. (in Russian) Маркелова Л. Н. Эксплуатация программоуправляемой вычислительной машины «Искра 226». — М.: Машиностроение, 1987. — С. 41—42.
  3. "Locale::RecodeData::KOI_8 - search.cpan.org". search.cpan.org.
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