KOI8-RU
Language(s)Belarusian, Ukrainian, Russian, Bulgarian
Classification8-bit KOI, extended ASCII
ExtendsKOI8-B
Based onKOI8-U, KOI8-R
Other related encoding(s)KOI8-E, KOI8-F

KOI8-RU is an 8-bit character encoding, designed to cover Russian, Ukrainian, and Belarusian which use a Cyrillic alphabet. It is closely related to KOI8-R, which covers Russian and Bulgarian, but replaces ten box drawing characters with five Ukrainian and Belarusian letters Ґ, Є, І, Ї, and Ў in both upper case and lower case. It is even more closely related to KOI8-U, which does not include Ў but otherwise makes the same letter replacements. The additional letter allocations are matched by KOI8-E, except for Ґ which is added to KOI8-F.

In IBM, KOI8-RU is assigned code page/CCSID 1167.[1][2]

KOI8 remains much more commonly used than ISO 8859-5, which never really caught on. Another common Cyrillic character encoding is Windows-1251. In the future, both may eventually give way to Unicode.

KOI8 stands for Kod obmena informatsiey, 8 bit (Russian: Код обмена информацией, 8 бит) which means "Code for Information Exchange, 8 bit".

The KOI8 character sets have the property that the Russian Cyrillic letters are in pseudo-Roman order rather than the natural Cyrillic alphabetical order as in ISO 8859-5. Although this may seem unnatural, it has the useful property that if the eighth bit is stripped, the text can still be read (or at least deciphered) in case-reversed transliteration on an ordinary ASCII terminal. For instance, "Русский Текст" in KOI8-RU becomes rUSSKIJ tEKST ("Russian Text") if the 8th bit is stripped.

Character set

The following table shows the KOI8-RU encoding. Each character is shown with its equivalent Unicode code point.

KOI8-RU[3][4][5]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0x
1x
2x  SP  ! " # $ % & ' ( ) * + , - . /
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 { | } ~
8x ─
2500		 │
2502		 ┌
250C		 ┐
2510		 └
2514		 ┘
2518		 ├
251C		 ┤
2524		 ┬
252C		 ┴
2534		 ┼
253C		 ▀
2580		 ▄
2584		 █
2588		 ▌
258C		 ▐
2590
9x ░
2591		 ▒
2592		 ▓
2593		 “[lower-alpha 1]
201C		 ■
25A0		 ∙
2219		 ”
201D		 —[lower-alpha 1]
2014		 №
2116		 ™[lower-alpha 1]
2122		 NBSP »
00BB		 ®
00AE		 «
00AB		 ·
00B7		 ¤
00A4
Ax ═
2550		 ║
2551		 ╒
2552		 ё
0451		 є[lower-alpha 2][lower-alpha 3]
0454		 ╔
2554		 і[lower-alpha 2][lower-alpha 3]
0456		 ї[lower-alpha 2][lower-alpha 3]
0457		 ╗
2557		 ╘
2558		 ╙
2559		 ╚
255A		 ╛
255B		 ґ[lower-alpha 2]
0491		 ў[lower-alpha 3]
045E		 ╞
255E
Bx ╟
255F		 ╠
2560		 ╡
2561		 Ё
0401		 Є[lower-alpha 2][lower-alpha 3]
0404		 ╣
2563		 І[lower-alpha 2][lower-alpha 3]
0406		 Ї[lower-alpha 2][lower-alpha 3]
0407		 ╦
2566		 ╧
2567		 ╨
2568		 ╩
2569		 ╪
256A		 Ґ[lower-alpha 2]
0490		 Ў[lower-alpha 3]
040E		 ©
00A9
Cx ю
044E		 а
0430		 б
0431		 ц
0446		 д
0434		 е
0435		 ф
0444		 г
0433		 х
0445		 и
0438		 й
0439		 к
043A		 л
043B		 м
043C		 н
043D		 о
043E
Dx п
043F		 я
044F		 р
0440		 с
0441		 т
0442		 у
0443		 ж
0436		 в
0432		 ь
044C		 ы
044B		 з
0437		 ш
0448		 э
044D		 щ
0449		 ч
0447		 ъ
044A
Ex Ю
042E		 А
0410		 Б
0411		 Ц
0426		 Д
0414		 Е
0415		 Ф
0424		 Г
0413		 Х
0425		 И
0418		 Й
0419		 К
041A		 Л
041B		 М
041C		 Н
041D		 О
041E
Fx П
041F		 Я
042F		 Р
0420		 С
0421		 Т
0422		 У
0423		 Ж
0416		 В
0412		 Ь
042C		 Ы
042B		 З
0417		 Ш
0428		 Э
042D		 Щ
0429		 Ч
0427		 Ъ
042A
  Differences from KOI8-R
  1. 1 2 3 Changed relative to KOI8-R to match Windows-1251.
  2. 1 2 3 4 5 6 7 8 Changed relative to KOI8-R to match KOI8-U.
  3. 1 2 3 4 5 6 7 8 Changed relative to KOI8-R to match KOI8-E.

Although RFC 2319 says that character 0x95 should be U+2219 (∙), it may also be U+2022 (•) to match the bullet character in Windows-1251.

Some references have a typo and incorrectly state that character 0xB4 is U+0403, rather than the correct U+0404. This typo is present in Appendix A of RFC 2319 (but the table in the main text of the RFC gives the correct mapping).

See also

References

  1. ↑ "Code page 1167 information document". Archived from the original on 2017-01-16.
  2. ↑ "CCSID 1167 information document". Archived from the original on 2016-03-27.
  3. ↑ Leisher, Mark (1999-12-20), KOI8-RU Belorusian/Ukrainian Cyrillic to Unicode 2.1 mapping table, KOI8RU.TXT
  4. ↑ Code Page CPGID 01167 (pdf) (PDF), IBM
  5. ↑ Code Page CPGID 01167 (txt), IBM
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