KOI8-U

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KOI8-U
Language(s)Ukrainian, Russian, Bulgarian
Classification8-bit KOI, extended ASCII
ExtendsKOI8-B
Based onKOI8-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[edit]

The following table shows the KOI8-U encoding.[1][4] Each character is shown with its equivalent Unicode code point.

KOI8-U
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

2320

25A0

2219

221A

2248

2264

2265
NBSP
2321
°
00B0
²
00B2
·
00B7
÷
00F7
Ax
2550

2551

2552
ё
0451
є
0454

2554
і
0456
ї
0457

2557

2558

2559

255A

255B
ґ
0491

255D

255E
Bx
255F

2560

2561
Ё
0401
Є
0404

2563
І
0406
Ї
0407

2566

2567

2568

2569

256A
Ґ
0490

256C
©
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 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[edit]

References[edit]

  1. ^ 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]
  2. ^ "CCSID information document; CCSID 1168; KOI8-U". IBM. Archived from the original on 2017-02-18. Retrieved 2017-02-18.
  3. ^ International Components for Unicode (ICU), ibm-1168_P100-2002.ucm, 2002-12-03
  4. ^ 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[edit]

External links[edit]