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KOI (КОИ) is a family of several "code pages for the "Cyrillic script. The name stands for Kod Obmena Informatsiey ("Russian: Код Обмена Информацией) which means "Code for Information Interchange".

A particular feature of the KOI code pages is that the text remains human-readable when the leftmost "bit is stripped, should it inadvertently pass through equipment or software that can only deal with 7 bit wide characters. This is due to characters being placed in a special order (128 codepoints apart from the Latin letter they sound most similar to), which, however, does not correspond to the alphabetic order in any language that is written in Cyrillic and necessitates the use of "lookup tables to perform "sorting.

These encodings are derived from "ASCII on the base of some correspondence between Latin and Cyrillic (nearly phonetical), which was already used in "Russian dialect of Morse code and in "MTK-2 telegraph code. The first 26 characters from А (0xE1) in KOI8-R are А, Б, Ц, Д, Е, Ф, Г, Х, И, Й, К, Л, М, Н, О, П, Я, Р, С, Т, У, Ж, В, Ь, Ы.

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KOI-7[edit]

The original KOI encoding (1967) was a 7-bit code page named "KOI-7 (КОИ-7), which did not contain lowercase letters. In KOI-7, the codes of the 31 or 32 Russian letters are ordered according to the Latin letters. Other code points are the same as in "ASCII (however, the "dollar sign $ (code point 24hex) may be replaced by the "universal currency sign ¤).

KOI-8[edit]

KOI-8 (КОИ-8), standardized in 1974 by GOST 19768, is a 8-bit "extensions of ASCII.[1][2] Originally it only included 32 lowercase and 31 uppercase Russian letters.

Later derivatives of KOI-8 constitute the family of encodings variously known as KOI8, KOI 8 and KOI-8.

The family members are:

DKOI[edit]

DKOI is an "EBCDIC-based encoding used in "ES EVM mainframes. It has been defined by several standards: GOST 19768-74 / ST SEV 358-76, ST SEV 358-88 / GOST 19768-93, CSN 36 9103.[16]

There are two variants:

Latin variants[edit]

Some encodings are called KOI, but define Latin alphabets:

References[edit]

  1. ^ a b Czyborra, Roman (1998-11-30) [1998-05-25]. "The Cyrillic Charset Soup". Archived from the original on 2016-12-03. Retrieved 2016-12-03. 
  2. ^ Flohr, Guido; Chernov, Andrey A. (2016) [2006]. "Locale::RecodeData::KOI_8 - Conversion routines for KOI-8". "CPAN libintl-perl. 1.0. Archived from the original on 2017-01-15. Retrieved 2017-01-15. 
  3. ^ a b da Cruz, Frank (2010-04-02). "Kermit and MIME Character-Set Names". The Kermit Project. "Columbia University, New York, USA. Archived from the original on 2016-12-02. Retrieved 2016-12-02. 
  4. ^ Yuri Demchenko. Registration of a Ukrainian Cyrillic Character Set KOI8-RU (as extension to Russian KOI8-R and ISO-IR-111) (Internet Draft). 1997. (Expired).
  5. ^ Flohr, Guido (2016) [2006]. "Locale::RecodeData::KOI8_RU - Conversion routines for KOI8-RU". "CPAN libintl-perl. Archived from the original on 2017-01-15. Retrieved 2017-01-15. 
  6. ^ "SBCS code page information - CPGID: 01167 / Name: Belarusian/Ukrainian KOI8-RU". IBM Software: Globalization: Coded character sets and related resources: Code pages by CPGID: Code page identifiers. "IBM. C-H 3-3220-050. Archived from the original on 2017-02-18. Retrieved 2017-02-18.  [1] [2]
  7. ^ "CCSID information document; CCSID 1167; KOI8-RU". "IBM. Archived from the original on 2017-02-18. Retrieved 2017-02-18. 
  8. ^ Leisher, Mark (2008) [1999-12-20]. "KOI8-RU Belorusian/Ukrainian Cyrillic to Unicode 2.1 mapping table". Department of Mathematical Sciences, New Mexico State University. Archived from the original on 2017-02-18. Retrieved 2017-02-18. 
  9. ^ Flohr, Guido; Davis, Michael (2016) [2006]. "Locale::RecodeData::KOI8_T - Conversion routines for KOI8-T". "CPAN libintl-perl. Archived from the original on 2017-01-15. Retrieved 2017-01-15. 
  10. ^ Discussion
  11. ^ "IANA Character Sets". 
  12. ^ ECMA-113. 8-Bit Single-Byte Coded Graphic Character Sets - Latin/Cyrillic Alphabet (1st ed., June 1986)
  13. ^ http://segfault.kiev.ua/cyrillic-encodings/
  14. ^ Leisher, Mark (2008) [1998-03-05]. "KOI8 Unified Cyrillic to Unicode 2.1 mapping table". Department of Mathematical Sciences, New Mexico State University. Archived from the original on 2017-02-18. Retrieved 2017-02-18. 
  15. ^ Serge Winitzki. Extended Cyrillic Character Set KOI8-C (Internet Draft). 2002. (Expired).
  16. ^ a b c d Petrlik, Lukas (1996-06-19). "The Czech and Slovak Character Encoding Mess Explained". cs-encodings-faq. 1.10. Archived from the original on 2016-06-21. Retrieved 2016-06-21. 
  17. ^ http://mlha.cz/unicode/
  18. ^ ISO-IR-139

Further reading[edit]

External links[edit]

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