Code page 866

Code page 866 (CP 866; Russian: Альтернативная кодировка) is a code page used under DOS and OS/2^[1] to write Cyrillic script.^[2] It is based on the "alternative code page" developed in 1986 by a research group at the Academy of Science of the USSR.^[3] The code page was widely used during the DOS era because it preserves the pseudographic symbols of code page 437 (unlike the "Main code page" or Windows-1251) and maintains alphabetical order (although non-contiguously) of Cyrillic letters (unlike KOI8-R). Initially, this encoding was only available in the Russian version of MS-DOS 4.01 (1990) and since MS-DOS 6.22 in any language version.

Not identical, but two very similar encodings are registered in GOST R 34.303-92^[4] as KOI-8 N1 and KOI-8 N2 (not to be confused with the original KOI-8).

Character set

Each character is shown with its equivalent Unicode code point and its decimal code point.

Letter Number Punctuation Symbol Other undefined

Code page 866^[5]^[6]
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_	NUL 0000 0	☺ 263A 1	☻ 263B 2	♥ 2665 3	♦ 2666 4	♣ 2663 5	♠ 2660 6	• 2022 7	◘ 25D8 8	○ 25CB 9	◙ 25D9 10	♂ 2642 11	♀ 2640 12	♪ 266A 13	♫ 266B 14	☼ 263C 15
1_	► 25BA 16	◄ 25C4 17	↕ 2195 18	‼ 203C 19	¶ 00B6 20	§ 00A7 21	▬ 25AC 22	↨ 21A8 23	↑ 2191 24	↓ 2193 25	→ 2192 26	← 2190 27	∟ 221F 28	↔ 2194 29	▲ 25B2 30	▼ 25BC 31
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	⌂ 2302 127
8_	А 0410 128	Б 0411 129	В 0412 130	Г 0413 131	Д 0414 132	Е 0415 133	Ж 0416 134	З 0417 135	И 0418 136	Й 0419 137	К 041A 138	Л 041B 139	М 041C 140	Н 041D 141	О 041E 142	П 041F 143
9_	Р 0420 144	С 0421 145	Т 0422 146	У 0423 147	Ф 0424 148	Х 0425 149	Ц 0426 150	Ч 0427 151	Ш 0428 152	Щ 0429 153	Ъ 042A 154	Ы 042B 155	Ь 042C 156	Э 042D 157	Ю 042E 158	Я 042F 159
A_	а 0430 160	б 0431 161	в 0432 162	г 0433 163	д 0434 164	е 0435 165	ж 0436 166	з 0437 167	и 0438 168	й 0439 169	к 043A 170	л 043B 171	м 043C 172	н 043D 173	о 043E 174	п 043F 175
B_	░ 2591 176	▒ 2592 177	▓ 2593 178	│ 2502 179	┤ 2524 180	╡ 2561 181	╢ 2562 182	╖ 2556 183	╕ 2555 184	╣ 2563 185	║ 2551 186	╗ 2557 187	╝ 255D 188	╜ 255C 189	╛ 255B 190	┐ 2510 191
C_	└ 2514 192	┴ 2534 193	┬ 252C 194	├ 251C 195	─ 2500 196	┼ 253C 197	╞ 255E 198	╟ 255F 199	╚ 255A 200	╔ 2554 201	╩ 2569 202	╦ 2566 203	╠ 2560 204	═ 2550 205	╬ 256C 206	╧ 2567 207
D_	╨ 2568 208	╤ 2564 209	╥ 2565 210	╙ 2559 211	╘ 2558 212	╒ 2552 213	╓ 2553 214	╫ 256B 215	╪ 256A 216	┘ 2518 217	┌ 250C 218	█ 2588 219	▄ 2584 220	▌ 258C 221	▐ 2590 222	▀ 2580 223
E_	р 0440 224	с 0441 225	т 0442 226	у 0443 227	ф 0444 228	х 0445 229	ц 0446 230	ч 0447 231	ш 0448 232	щ 0449 233	ъ 044A 234	ы 044B 235	ь 044C 236	э 044D 237	ю 044E 238	я 044F 239
F_	Ё 0401 240	ё 0451 241	Є 0404 242	є 0454 243	Ї 0407 244	ї 0457 245	Ў 040E 246	ў 045E 247	° 00B0 248	∙ 2219 249	· 00B7 250	√ 221A 251	№ 2116 252	¤ 00A4 253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

Variants

There existed a few variants of the code page, but the differences were mostly in the last 16 code points (240–255).

Code page 808

IBM code page 808 is a variant of code page 866; the only difference is the euro sign (€) in position FD_hex (253) replacing the universal currency sign (¤).^[7]

Alternative code page

The original version of the code page by Bryabrin et al. (1986),^[3] called the "Alternative code page" (Russian: Альтернативная кодировка) to distinguish it from the "Main code page" (Russian: Основная кодировка) by the same authors.

Alternative code page
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
F_	Ё 0401 240	ё 0451 241	╭ 256D 242	╮ 2264 243	╯ 256F 244	╰ 2570 245	→ 2192 246	← 2190 247	↓ 2193 248	↑ 2191 249	÷ 00F7 250	± 00B1 251}	№ 2116 252	¤ 00A4 253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

Modified code page 866

An unofficial variant with code points 240–255 identical to code page 437. However, the letter Ёё is usually placed at 240 and 241.^[8]

Modified CP 866
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
F_	Ё 0401 240	ё 0451 241	≥ 2265 242	≤ 2264 243	⌠ 2320 244	⌡ 2321 245	÷ 00F7 246	≈ 2248 247	° 00B0 248	∙ 2219 249	· 00B7 250	√ 221A 251}	ⁿ 207F 252	² 00B2 253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

Code page 1125/848

IBM code page 1125/848^[9]^[10] (Ukrainian standard RST 2018-91^[11])
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
F_	Ё 0401 240	ё 0451 241	Ґ 0490 242	ґ 0491 243	Є 0404 244	є 0454 245	І 0406 246	і 0456 247	Ї 0407 248	ї 0457 249	÷ 00F7 250	± 00B1 251}	№ 2116 252	¤/€ 00A4/20AC 253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

Code page 1131/849

IBM code page 1131/849 (Belarusian)^[12]^[13]
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
F_	Ё 0401 240	ё 0451 241	Є 0404 242	є 0454 243	Ї 0407 244	ї 0457 245	Ў 040E 246	ў 045E 247	І 0406 248	і 0456 249	· 00B7 250	¤/€ 00A4/20AC 251}	Ґ 0490 252	ґ 0491 253	∙ 2219 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

GOST R 34.303-92

Two variants from GOST R 34.303-92. The first one, KOI-8 N1, leaves several code points empty for further internationalization (compare with code page 850).

The second one, KOI-8 N2, adds letters for Belarusian and Ukrainian. Code points 176–239 are identical to code page 866.

KOI-8 N1 (GOST R 34.303-92)
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
B_	░ 2591 176	▒ 2592 177	▓ 2593 178	│ 2502 179	┤ 2524 180	181	182	183	184	╣ 2563 185	║ 2551 186	╗ 2557 187	╝ 255D 188	189	190	┐ 2510 191
C_	└ 2514 192	┴ 2534 193	┬ 252C 194	├ 251C 195	─ 2500 196	┼ 253C 197	198	199	╚ 255A 200	╔ 2554 201	╩ 2569 202	╦ 2566 203	╠ 2560 204	═ 2550 205	╬ 256C 206	207
D_	208	209	210	211	212	213	214	215	216	┘ 2518 217	┌ 250C 218	█ 2588 219	▄ 2584 220	▌ 258C 221	▐ 2590 222	▀ 2580 223
E_	р 0440 224	с 0441 225	т 0442 226	у 0443 227	ф 0444 228	х 0445 229	ц 0446 230	ч 0447 231	ш 0448 232	щ 0449 233	ъ 044A 234	ы 044B 235	ь 044C 236	э 044D 237	ю 044E 238	я 044F 239
F_	SHY 00AD 240	№ 2116 241	242	243	Ё 0401 244	ё 0451 245	246	247	248	249	250	251}	252	253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

KOI-8 N2 (GOST R 34.303-92)
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
B_	░ 2591 176	▒ 2592 177	▓ 2593 178	│ 2502 179	┤ 2524 180	╡ 2561 181	╢ 2562 182	╖ 2556 183	╕ 2555 184	╣ 2563 185	║ 2551 186	╗ 2557 187	╝ 255D 188	╜ 255C 189	╛ 255B 190	┐ 2510 191
C_	└ 2514 192	┴ 2534 193	┬ 252C 194	├ 251C 195	─ 2500 196	┼ 253C 197	╞ 255E 198	╟ 255F 199	╚ 255A 200	╔ 2554 201	╩ 2569 202	╦ 2566 203	╠ 2560 204	═ 2550 205	╬ 256C 206	╧ 2567 207
D_	╨ 2568 208	╤ 2564 209	╥ 2565 210	╙ 2559 211	╘ 2558 212	╒ 2552 213	╓ 2553 214	╫ 256B 215	╪ 256A 216	┘ 2518 217	┌ 250C 218	█ 2588 219	▄ 2584 220	▌ 258C 221	▐ 2590 222	▀ 2580 223
E_	р 0440 224	с 0441 225	т 0442 226	у 0443 227	ф 0444 228	х 0445 229	ц 0446 230	ч 0447 231	ш 0448 232	щ 0449 233	ъ 044A 234	ы 044B 235	ь 044C 236	э 044D 237	ю 044E 238	я 044F 239
F_	SHY 00AD 240	№ 2116 241	Ґ 0490 242	ґ 0491 243	Ё 0401 244	ё 0451 245	Є 0404 246	є 0454 247	І 0406 248	і 0456 249	Ї 0407 250	ї 0457 251}	Ў 040E 252	ў 045E 253	■ 25A0 254	NBSP 00A0 255
	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F

FreeDOS

FreeDOS provides additional unofficial extensions of code page 866 for various non-Slavic languages:^[14]

30002 - Cyrillic Tajik
30008 - Cyrillic Abkhaz and Ossetian
30010 - Cyrillic Gagauz and Moldovan
30011 - Cyrillic Russian Southern District (Kalmyk, Karachay-Balkar, Ossetian, North Caucasian)
30012 - Cyrillic Russian Siberian and Far Eastern Districts (Altai, Buryat, Khakas, Tuvan, Yakut, Tungusic, Paleo-Siberian)
30013 - Cyrillic Volga District - Turkic languages (Bashkir, Chuvash, Tatar)
30014 - Cyrillic Volga District - Finno-Ugric languages (Mari, Udmurt)
30015 - Cyrillic Khanty
30016 - Cyrillic Mansi
30017 - Cyrillic Northwestern District (Cyrillic Nenets, Latin Karelian, Latin Veps)
30018 - Latin Tatar and Cyrillic Russian
30019 - Latin Chechen and Cyrillic Russian
3012 - Latin Latvian and Cyrillic Russian ("RusLat")
58152 - Cyrillic Kazakh with Euro
58210 - Cyrillic Azeri
59234 - Cyrillic Tatar
60258 - Latin Azeri and Cyrillic Russian
62306 - Cyrillic Uzbek

Code page 900

Before Microsoft's final code page for Russian MS-DOS 4.01 was registered with IBM by Franz Rau of Microsoft as CP866 in January 1990, draft versions of it developed by Yuri Starikov (Юрий Стариков) of Dialogue were still called code page 900 internally. While the documentation was corrected to reflect the new name before the release of the product, sketches of earlier draft versions still named code page 900 and without Ukrainian and Belarusian letters, which had been added in autumn 1989, were published in the Russian press in 1990.^[15] Code page 900 slipped through into the distribution of the Russian MS-DOS 5.0 LCD.CPI codepage information file.^[16]

References

↑ "OS/2" (in Russian).
↑ "Code Pages Supported by Windows: OEM Code Pages". Go Global Development Center. Microsoft. Retrieved 2011-10-11.
1 2 (in Russian) Брябрин В. М., Ландау И. Я., Неменман М. Е. О системе кодирования для персональных ЭВМ // Микропроцессорные средства и системы. — 1986. — № 4. — С. 61–64.
↑ (in Russian) ГОСТ Р 34.303-92. Наборы 8-битных кодированных символов. 8-битный код обмена и обработки информации. = 8-bit coded character sets. 8-bit code for information interchange.
↑ "OEM 866". Go Global Development Center. Microsoft. Retrieved 2011-10-17.
↑ "CP 00866". IBM Globalization.
↑ "CP 00808". IBM Globalization.
↑ (in Russian) Фигурнов В. Э. IBM PC для пользователя. — 2-е изд. — М.: 1992. — С. 279.
↑ "CP 01025". IBM Globalization.
↑ "CP 00848". IBM Globalization.
↑ (in Ukrainian) РСТ УРСР 2018-91. Система обробки інформації. Кодування символів української абетки 8-бітними кодами.
↑ "CP 01031". IBM Globalization.
↑ "CP 00849". IBM Globalization.
↑ "CPIDOS - CPX files (Code Page Information) Pack v3.0 - DOS codepages". FreeDOS.
↑ Starikov, Yuri (2005-04-11). "15-летию Russian MS-DOS 4.01 посвящается" [15 Years of Russian MS-DOS 4.01] (in Russian). Archived from the original on 2016-12-03. Retrieved 2014-05-07.
↑ Paul, Matthias (2001-06-10) [1995]. "Overview on DOS, OS/2, and Windows codepages" (CODEPAGE.LST file) (1.59 preliminary ed.). Archived from the original on 2016-04-20. Retrieved 2016-08-20.

Character encodings
Early telecommunications	ASCII ISO/IEC 646 ISO/IEC 6937 T.61 BCDIC Baudot code Morse code Telegraph code Wabun code Special telegraphy codes Non-Latin Chinese Cyrillic Needle telegraph codes
ISO/IEC 8859	-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16
Bibliographic use	ANSEL ISO 5426 / 5426-2 / 5427 / 5428 / 6438 / 6861 / 6862 / 10585 / 10586 / 10754 / 11822 MARC-8
National standards	ArmSCII BraSCII CNS 11643 ELOT 927 GOST 10859 GB 18030 HKSCS I.S. 434 ISCII JIS X 0201 JIS X 0208 JIS X 0212 JIS X 0213 KOI-7 KPS 9566 KS X 1001 PASCII SI 960 TIS-620 TSCII VISCII VSCII YUSCII
EUC	CN JP KR TW
ISO/IEC 2022	CN JP KR CCCII
MacOS code pages ("scripts")	Armenian Arabic Barents Cyrillic Celtic CentEuro ChineseSimp / EUC-CN ChineseTrad / Big5 Croatian Cyrillic Devanagari Dingbats Farsi (Persian) Gaelic Georgian Greek Gujarati Gurmukhi Hebrew Iceland Inuit Japanese / ShiftJIS Keyboard Korean / EUC-KR Latin (Kermit) Maltese/Esperanto Ogham / I.S. 434 Roman Romanian Sámi Symbol Thai / TIS-620 Turkish Turkic Latin Turkic Cyrillic Ukrainian
DOS code pages	100 111 112 113 151 152 161 162 163 164 165 166 210 220 301 437 449 489 620 667 668 707 708 709 710 711 714 715 720 721 737 768 770 771 772 773 774 775 776 777 778 790 850 851 852 853 854 855/872 856 857 858 859 860 861 862 863 864/17248 865 866/808 867 868 869 874/1161/1162 876 877 878 881 882 883 884 885 891 895 896 897 898 899 900 903 904 906 907 909 910 911 926 927 928 929 932 934 936 938 941 942 943 944 946 947 948 949 950/1370 951 966 991 1034 1039 1040 1041 1042 1043 1044 1046 1086 1088 1092 1093 1098 1108 1109 1114 1115 1116 1117 1118 1119 1125/848 1126 1127 1131/849 1139 1167 1168 1300 1351 1361 1362 1363 1372 1373 1374 1375 1380 1381 1385 1386 1391 1392 1393 1394 CWI-2 Iran System Kamenický KOI8 Mazovia MIK
IBM AIX code pages	367 371 806 813 819 895 896 912 913 914 915 916 919 920 921/901 922/902 923 952 953 954 955 956 957 958 959 960 961 963 964 965 970 971 1004 1006 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1029 1036 1089 1111 1124 1129/1163 1133 1350 1382 1383
IBM Apple MacIntosh emulations	1275 1280 1281 1282 1283 1284 1285 1286
IBM Adobe emulations	1038 1276 1277
IBM DEC emulations	1020 1021 1023 1090 1100 1101 1102 1103 1104 1105 1106 1107 1287 1288
IBM HP emulations	1050 1051 1052 1053 1054 1055 1056 1057 1058
Windows code pages	CER-GS 874/1162 (TIS-620) 932/943 (Shift JIS) 936/1386 (GBK) 950/1370 (Big5) 949/1363 (EUC-KR) 1169 1174 Extended Latin-8 1200 (UTF-16LE) 1201 (UTF-16BE) 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1261 1270 54936 (GB18030)
EBCDIC code pages	1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37/1140 37-2 38 39 40 251 252 254 256 257 258 259 260 264 273/1141 274 275 276 277/1142 278/1143 279 280/1144 281 282 283 284/1145 285/1146 286 287 288 289 290 293 297/1147 298 300 310 320 321 322 330 351 352 353 355 357 358 359 360 361 363 382 383 384 385 386 387 388 389 390 391 392 393 394 395 410 420/16804 421 423 424/8616/12712 425 435 500/1148 803 829 833 834 835 836 837 838/838 839 870/1110/1153 871/1149 875/4971/9067 880 881 882 883 884 885 886 887 888 889 890 892 893 905 918 924 930/1390 931 933/1364 935/1388 937/1371 939/1399 1001 1002 1003 1005 1007 1024 1025/1154 1026/1155 1027 1028 1030 1031 1032 1033 1037 1047 1068 1069 1070 1071 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1087 1091 1097 1112/1156 1113 1122/1157 1123/1158 1130/1164 1132 1136 1137 1150 1151 1152 1159 1165 1166 1278 1279 1303 1364 1376 1377 JEF KEIS
Platform specific	Acorn Adobe Standard Adobe Latin 1 Apple II ATASCII Atari ST BICS Casio calculators CDC CPC DEC Radix-50 DEC MCS/NRCS DG International ELWRO-Junior FIELDATA GEM GEOS GSM 03.38 HP Roman Extension HP Roman-8 HP Roman-9 HP FOCAL HP RPL LICS LMBCS Mattel Aquarius Minitel MSX NEC APC NeXT PCW PETSCII Sharp calculators Sinclair QL Teletext TI calculators TRS-80 Ventura International Ventura Symbol WISCII XCCS ZX80 ZX81 ZX Spectrum
Unicode / ISO/IEC 10646	UTF-1 UTF-7 UTF-8 UTF-16 (UTF-16LE/UTF-16BE) / UCS-2 UTF-32 (UTF-32LE/UTF-32BE) / UCS-4 UTF-EBCDIC GB 18030 BOCU-1 CESU-8 SCSU
TeX typesetting system	Cork LGR LY1 OML OMS OMX OT1 OT2 OT3 OT4 T2A T2B T2C T2D T3 T4 T5 TS1 TS3 U X2
Miscellaneous code pages	ABICOMP APL ARIB STD-B24 HZ INIS INIS-8 ISO-IR-111 ISO-IR-182 ISO-IR-197 ISO-IR-200 ISO-IR-201 Johab SEASCII Stanford/ITS TACE16 TRON UTF-5 UTF-6 WTF-8
Related topics	Code page Control character (C0 C1) CCSID Character encodings in HTML Charset detection Han unification Hardware ISO 6429/IEC 6429/ANSI X3.64 Mojibake
Character sets