The Windows-1251 reference article from the English Wikipedia on 24-Apr-2004
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Windows-1251

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Windows-1251 is an 8-bit character encoding, designed to cover languages that use the Cyrillic alphabet such as Russian and other languages.

Windows-1251 and KOI8-R (or its Ukrainian variant KOI8-U) are much more commonly used than ISO 8859-5, which never really caught on. In recent times, both might eventually give way to Unicode.

KOI8-R
x0x1x2x3x4x5x6x7x8x9xAxBxCxDxExF
0xunused
1x
2xSPexclamation markdouble quote#dollar sign%&'()*+comma -full stop/
3x 0123456789colon semicolon<=>question mark
4x@ABCDEFGHIJKLMNO
5xPQRSTUVWXYZ[\\]^_
6x`abcdefghijklmno
7xpqrstuvwxyz{|}~
8xЂЃѓЉЊЌЋЏ
9xђunusedљњќћџ
AxNBSPЎўЈ¤Ґ¦§Ё©Є«¬SHY®Ї
Bx°±Ііґµ·ёє»јЅѕї
CxАБВГДЕЖЗИЙКЛМНОП
DxРСТУФХЦЧШЩЪЫЬЭЮЯ
Exабвгдежзийклмноп
Fxрстуфхцчшщъыьэюя

In the table above, 20 is the regular SPACE character, AO is the NO-BREAK SPACE, and AD is SOFT HYPHEN.

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