KOI-8 (КОИ-8) is an 8-bit character set standardized in GOST 19768-74.^[1][2] It is an extension ofKOI-7 which allows the use of theLatin alphabet along with theRussian alphabet, both the upper and lower case letters; however, the letterЁё and the uppercaseЪ are missed, the latter to avoid conflicts with thedelete character (both are added in most extensions, seeKOI8-B). The first 127 code points are identical toASCII with the exception of thedollar sign $ (code point 24_hex) replaced by theuniversal currency sign ¤. The rowsx8_ andx9_ (code points 128–159) might be filled with the additional control characters fromEBCDIC (code points 32–63).

This standard has become the base for the laterInternet standards such asKOI8-RU.

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

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

• KOI character encodings

• Character sets
• Computing in the Soviet Union

• Articles with Russian-language sources (ru)
• Articles with short description
• Short description is different from Wikidata