KOI8-R

KOI8-R (RFC 1489) is an 8-bit character encoding derived from the KOI-8 encoding by the programmer Andrei Chernov in 1993 and designed to cover Russian, which uses the Russian subset of a Cyrillic script. KOI-8, on its turn, is an 8-bit extension of the KOI-7 encoding, which inherited a phonetic correspondence of Russian and Latin letters from the MTK-2 teletype code. As a result, Russian Cyrillic letters in KOI8-R are in pseudo-Latin alphabetical order rather than the normal Cyrillic one like in ISO 8859-5. Although this may seem unnatural, this has the useful effect that if the 8th bit is stripped, the text remains partially readable in any ASCII-based encoding (including KOI8-R itself) as a case-reversed transliteration. For example, "Код для обмена и обработки информации" (the Russian meaning of the "KOI" acronym) becomes kOD DLQ OBMENA I OBRABOTKI INFORMACII.

KOI-8 stands for 8-bitnyy kod dlya obmena i obrabotki informatsii (Russian: 8-битный код для обмена и обработки информации) which means "8-Bit Code for Information Interchange".^[1] In Microsoft Windows, KOI8-R is assigned the code page number 20866. In IBM, KOI8-R is assigned code page 878.^{[2] [3]} KOI8-R also happens to cover Bulgarian.

It lacks proper quotation marks for these languages: both «...» and the Bulgarian „...". Windows-1251 does support these, as well as more letters, and has thus become more popular. KOI8-R is used by less than 0.004% of websites, mostly Russian and Bulgarian.^{[citation needed ]} Unicode and UTF-8 is preferred to single-byte Cyrillic encodings in modern applications, Unicode contains 436 Cyrillic letters including for Old Cyrillic.

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

• KOI8-B, a derivation of KOI8-R with only the letter subset implemented
• KOI8-U, another derivative encoding which adds Ukrainian characters
• KOI character encodings
• RELCOM
• Windows-1251, another common Cyrillic character encoding

• Flohr, Guido; Kiss, Gabor; Chernov, Andrey A. (2016) [2006]. "Locale::RecodeData::KOI8_R - Conversion routines for KOI8-R". CPAN libintl-perl. 1.0. Archived from the original on 2017年01月15日. Retrieved 2017年01月15日.
• Kostis, Kosta. "koi8-r (Russian U*IX encoding, also used by RELCOM)". 1.20. Archived from the original on 2017年01月16日. Retrieved 2017年01月16日.
• RFC 1489
• "KOI8-R (RFC 1489)". Kermit . Columbia University . Retrieved 2020年06月24日.
• 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年03月13日). "CYRILLIC ENCODING FAQ Version 1.3". 1.3. Retrieved 2020年06月24日.

• Universal Cyrillic decoder, an online program that may help recovering Cyrillic texts with broken KOI8-R or other character encodings.
• "The Home of the KOI8-R since 1995". 1995. Retrieved 2016年12月05日.
• Czyborra, Roman (1998年11月30日) [1998年05月25日]. "The Cyrillic Charset Soup". Archived from the original on 2016年12月03日. Retrieved 2016年12月03日.
• Hohlov, Yu. E. "Cyrillic Information Representation in Electronic Form - Character Set (Code Page) Tables". Archived from the original on 2016年12月05日. Retrieved 2016年12月05日.
• Nechayev, Valentin (2013) [2001]. "Review of 8-bit Cyrillic encodings universe". Archived from the original on 2016年12月05日. Retrieved 2016年12月05日.

• Character sets
• Computing in the Soviet Union

• Articles with Russian-language sources (ru)
• Articles with short description
• Short description is different from Wikidata
• Articles containing Russian-language text
• All articles with unsourced statements
• Articles with unsourced statements from April 2023