KOI8-U
| Language(s) | Ukrainian, Russian, Bulgarian |
|---|---|
| Classification | 8-bit KOI, extended ASCII |
| Extends | KOI8-B |
| Based on | KOI8-R |
| Other related encoding(s) | KOI8-RU, KOI8-F |
KOI8-U (RFC 2319) is an 8-bit character encoding, designed to cover Ukrainian, which uses a Cyrillic alphabet. It is based on KOI8-R, which covers Russian and Bulgarian, but replaces eight box drawing characters with four Ukrainian letters Ґ, Є, І, and Ї in both upper case and lower case.
KOI8-RU is closely related, but adds Ў for Belarusian. In both, the letter allocations match those in KOI8-E, except for Ґ which is added to KOI8-F.
In Microsoft Windows, KOI8-U is assigned the code page number 21866. In IBM, KOI8-U is assigned code page/CCSID 1168.[1][2][3]
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-U becomes rUSSKIJ tEKST ("Russian Text") if the 8th bit is stripped.
Character set
The following table shows the KOI8-U encoding.[1][4] Each character is shown with its equivalent Unicode code point.
Letter Number Punctuation Symbol Other Undefined Differences with KOI8-R (non-Russian letters)
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
- ^ a b "SBCS code page information - CPGID: 01168 / Name: Ukrainian KOI8-U". 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]
- ^ "CCSID information document; CCSID 1168; KOI8-U". IBM. Archived from the original on 2017-02-18. Retrieved 2017-02-18.
- ^ International Components for Unicode (ICU), ibm-1168_P100-2002.ucm, 2002-12-03
- ^ Verdy, Philippe; Richter, Helmut (2016-01-04) [2008-10-13]. "KOI8-U.TXT". 2.0. Retrieved 2016-12-09.
{{cite web}}: CS1 maint: url-status (link)
Further reading
- Flohr, Guido (2016) [2006]. "Locale::RecodeData::KOI8_U - Conversion routines for KOI8-U". CPAN libintl-perl. 1.1. Archived from the original on 2017-01-15. Retrieved 2017-01-15.
- RFC 2319
- "KOI8-U (RFC 2319)". Kermit. Columbia University. Retrieved 2020-06-24.
{{cite web}}: CS1 maint: url-status (link) - Leishner, Mark (2008) [1999-12-20]. "KOI8-U Belorussian/Ukrainian Cyrillic to Unicode 2.1 mapping table - Based on RFC 2319". Department of Mathematical Sciences, New Mexico State University. Archived from the original on 2017-02-19. Retrieved 2017-02-19.
- Kornai, Andras; Birnbaum, David J.; da Cruz, Frank; Davis, Bur; Fowler, George; Paine, Richard B.; Paperno, Slava; Simonsen, Keld J.; Thobe, Glenn E.; Vulis, Dimitri; van Wingen, Johan W. (1993-03-13). "CYRILLIC ENCODING FAQ Version 1.3". 1.3. Retrieved 2020-06-24.
{{cite web}}: CS1 maint: url-status (link)
External links
- Czyborra, Roman (1998-11-30) [1998-05-25]. "The Cyrillic Charset Soup". Archived from the original on 2016-12-03. Retrieved 2016-12-03.
- Hohlov, Yu. E. "Cyrillic Information Representation in Electronic Form - Character Set (Code Page) Tables". Archived from the original on 2016-12-05. Retrieved 2016-12-05.
- Nechayev, Valentin (2013) [2001]. "Review of 8-bit Cyrillic encodings universe". Archived from the original on 2016-12-05. Retrieved 2016-12-05.
- https://web.archive.org/web/20050206230944/http://www.net.ua/KOI8-U/
| Early telecommunications | |
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| ISO/IEC 8859 |
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| Bibliographic use | |
| National standards | |
| ISO/IEC 2022 | |
| Mac OS Code pages ("scripts") | |
| DOS code pages | |
| IBM AIX code pages | |
| Windows code pages | |
| EBCDIC code pages | |
| DEC terminals (VTx) | |
| Platform specific |
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| Unicode / ISO/IEC 10646 | |
| TeX typesetting system | |
| Miscellaneous code pages | |
| Control character | |
| Related topics | |
