KOI8-RU

KOI8-RU is an 8-bit character encoding, designed to cover Russian, Ukrainian, and Belarusian which use a Cyrillic alphabet. It is based on KOI8-R, which covers Russian and Bulgarian, but replaces eight graphic characters with five Ukrainian and Belarusian letters Ґ, Є, І, Ї, and Ў in both upper case and lower case.

In IBM, KOI8-U is assigned code page 1167.[1][2]

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-RU becomes rUSSKIJ tEKST ("Russian Text") if the 8th bit is stripped.

Character set

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

KOI8-RU
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
 
0_
 
 
1_
 
 
2_
 		 SP
0020
32		 !
0021
33		 "
0022
34		 #
0023
35		 $
0024
36		 %
0025
37		 &
0026
38		 '
0027
39		 (
0028
40		 )
0029
41		 *
002A
42		 +
002B
43		 ,
002C
44		 -
002D
45		 .
002E
46		 /
002F
47
 
3_
 		 0
0030
48		 1
0031
49		 2
0032
50		 3
0033
51		 4
0034
52		 5
0035
53		 6
0036
54		 7
0037
55		 8
0038
56		 9
0039
57		 :
003A
58		 ;
003B
59		 <
003C
60		 =
003D
61		 >
003E
62		 ?
003F
63
 
4_
 		 @
0040
64		 A
0041
65		 B
0042
66		 C
0043
67		 D
0044
68		 E
0045
69		 F
0046
70		 G
0047
71		 H
0048
72		 I
0049
73		 J
004A
74		 K
004B
75		 L
004C
76		 M
004D
77		 N
004E
78		 O
004F
79
 
5_
 		 P
0050
80		 Q
0051
81		 R
0052
82		 S
0053
83		 T
0054
84		 U
0055
85		 V
0056
86		 W
0057
87		 X
0058
88		 Y
0059
89		 Z
005A
90		 [
005B
91		 \
005C
92		 ]
005D
93		 ^
005E
94		 _
005F
95
 
6_
 		 `
0060
96		 a
0061
97		 b
0062
98		 c
0063
99		 d
0064
100		 e
0065
101		 f
0066
102		 g
0067
103		 h
0068
104		 i
0069
105		 j
006A
106		 k
006B
107		 l
006C
108		 m
006D
109		 n
006E
110		 o
006F
111
 
7_
 		 p
0070
112		 q
0071
113		 r
0072
114		 s
0073
115		 t
0074
116		 u
0075
117		 v
0076
118		 w
0077
119		 x
0078
120		 y
0079
121		 z
007A
122		 {
007B
123		 |
007C
124		 }
007D
125		 ~
007E
126
 
8_
 		 ─
2500
128		 │
2502
129		 ┌
250C
130		 ┐
2510
131		 └
2514
132		 ┘
2518
133		 ├
251C
134		 ┤
2524
135		 ┬
252C
136		 ┴
2534
137		 ┼
253C
138		 ▀
2580
139		 ▄
2584
140		 █
2588
141		 ▌
258C
142		 ▐
2590
143
 
9_
 		 ░
2591
144		 ▒
2592
145		 ▓
2593
146		 “
201C
147		 ■
25A0
148		 ∙
2219
149		 ”
201D
150		 —
2014
151		 №
2116
152		 ™
2122
153		 NBSP
00A0
154		 »
00BB
155		 ®
00AE
156		 «
00AB
157		 ·
00B7
158		 ¤
00A4
159
 
A_
 		 ═
2550
160		 ║
2551
161		 ╒
2552
162		 ё
0451
163		 є
0454
164		 ╔
2554
165		 і
0456
166		 ї
0457
167		 ╗
2557
168		 ╘
2558
169		 ╙
2559
170		 ╚
255A
171		 ╛
255B
172		 ґ
0491
173		 ў
045D
174		 ╞
255E
175
 
B_
 		 ╟
255F
176		 ╠
2560
177		 ╡
2561
178		 Ё
0401
179		 Є
0404
180		 ╣
2563
181		 І
0406
182		 Ї
0407
183		 ╦
2566
184		 ╧
2567
185		 ╨
2568
186		 ╩
2569
187		 ╪
256A
188		 Ґ
0490
189		 Ў
040D
190		 ©
00A9
191
 
C_
 		 ю
044E
192		 а
0430
193		 б
0431
194		 ц
0446
195		 д
0434
196		 е
0435
197		 ф
0444
198		 г
0433
199		 х
0445
200		 и
0438
201		 й
0439
202		 к
043A
203		 л
043B
204		 м
043C
205		 н
043D
206		 о
043E
207
 
D_
 		 п
043F
208		 я
044F
209		 р
0440
210		 с
0441
211		 т
0442
212		 у
0443
213		 ж
0436
214		 в
0432
215		 ь
044C
216		 ы
044B
217		 з
0437
218		 ш
0448
219		 э
044D
220		 щ
0449
221		 ч
0447
222		 ъ
044A
223
 
E_
 		 Ю
042E
224		 А
0410
225		 Б
0411
226		 Ц
0426
227		 Д
0414
228		 Е
0415
229		 Ф
0424
230		 Г
0413
231		 Х
0425
232		 И
0418
233		 Й
0419
234		 К
041A
235		 Л
041B
236		 М
041C
237		 Н
041D
238		 О
041E
239
 
F_
 		 П
041F
240		 Я
042F
241		 Р
0420
242		 С
0421
243		 Т
0422
244		 У
0423
245		 Ж
0416
246		 В
0412
247		 Ь
042C
248		 Ы
042B
249		 З
0417
250		 Ш
0428
251		 Э
042D
252		 Щ
0429
253		 Ч
0427
254		 Ъ
042A
255
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F

In the table above, 0x20 is the regular SPACE character, and 0x9A is the NO-BREAK SPACE.

The difference with KOI8-R consists of the positions 0xA4; 0xA6; 0xA7; 0xAD; and 0xB4; 0xB6; 0xB7; 0xBD; which consist of extra letters that don't exist in Russian.

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

  1. 1 2 "SBCS code page information - CPGID: 01167 / 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.
  2. ↑ "CCSID information document; CCSID 1167; KOI8-U". IBM. Archived from the original on 2017-02-18. Retrieved 2017-02-18.


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