VISCII - The Encyclopedia

From Wikipedia, the free encyclopedia.

The Vietnamese Standard Code for Information Interchange (VISCII) is a character set comprising the Vietnamese alphabet, punctuation, and other graphemes. Vietnamese requires slightly too many (134) letter/diacritic combinations to make a traditional extended ASCII character set for it. There are essentially 3 possible solutions to this.

Use a variable width encoding
Use combining diacritical marks, as Windows-1258 does
Replace something from ASCII

VISCII went for the last option, replacing 6 of the least problematic (e.g., least likely to be recognised by an application and acted on specially) C0 control codes (STX, ENQ, ACK, DC4, EM, and RS) with 6 of the least used uppercase letter/diacritic combinations. While this may cause issues with some programs in handling VISCII text if they use those control codes, it creates fewer complications than either of the other two solutions. However, it leaves absolutely no space available for things other than accented letters such as symbols, superscripted numbers, curved quotes, proper dashes, etc.

It's developed in 1992 by Vietnamese Standardization Group (Viet-Std Group) from TriChlor group in California and is officially registered as ISO-IR-180. VISCII, along with other Vietnamese-specific character sets, fell out of usage with the adoption of Unicode.

[edit] Code page layout

	–0	–1	–2	–3	–4	–5	–6	–7	–8	–9	–A	–B	–C	–D	–E	–F
0−	NUL 00	SOH 01	Ẳ 1EB2	ETX 03	EOT 04	Ẵ 1EB4	Ẫ 1EAA	BEL 07	BS 08	HT 09	LF 0A	VT 0B	FF 0C	CR 0D	SO 0E	SI 0F
1−	DLE 10	DC1 11	DC2 12	DC3 13	Ỷ 1EF6	NAC 15	SYN 16	ETB 17	CAN 18	Ỹ 1EF8	SUB 1A	ESC 1B	FS 1C	GS 1D	Ỵ 1EF4	US 1F
2−	SP 20	! 21	" 22	# 23	$ 24	% 25	& 26	' 27	( 28	) 29	* 2A	+ 2B	, 2C	- 2D	. 2E	/ 2F
3−	0 30	1 31	2 32	3 33	4 34	5 35	6 36	7 37	8 38	9 39	: 3A	; 3B	< 3C	= 3D	> 3E	? 3F
4−	@ 40	A 41	B 42	C 43	D 44	E 45	F 46	G 47	H 48	I 49	J 4A	K 4B	L 4C	M 4D	N 4E	O 4F
5−	P 50	Q 51	R 52	S 53	T 54	U 55	V 56	W 57	X 58	Y 59	Z 5A	[ 5B	\ 5C	] 5D	^ 5E	_ 5F
6−	` 60	a 61	b 62	c 63	d 64	e 65	f 66	g 67	h 68	i 69	j 6A	k 6B	l 6C	m 6D	n 6E	o 6F
7−	p 70	q 71	r 72	s 73	t 74	u 75	v 76	w 77	x 78	y 79	z 7A	{ 7B	\| 7C	} 7D	~ 7E	DEL 7F
8−	Ạ 1EA0	Ắ 1EAE	Ằ 1EB0	Ặ 1EB6	Ấ 1EA4	Ầ 1EA6	Ẩ 1EA8	Ậ 1EAC	Ẽ 1EBC	Ẹ 1EB8	Ế 1EBE	Ề 1EC0	Ể 1EC2	Ễ 1EC4	Ệ 1EC6	Ố 1ED0
9−	Ồ 1ED2	Ổ 1ED4	Ỗ 1ED6	Ộ 1ED8	Ợ 1EE2	Ớ 1EDA	Ờ 1EDC	Ở 1EDE	Ị 1ECA	Ỏ 1ECE	Ọ 1ECC	Ỉ 1EC8	Ủ 1EE6	Ũ 0168	Ụ 1EE4	Ỳ 1EF2
A−	Õ D5	ắ 1EAF	ằ 1EB1	ặ 1EB7	ấ 1EA5	ầ 1EA7	ẩ 1EA9	ậ 1EAD	ẽ 1EBD	ẹ 1EB9	ế 1EBF	ề 1EC1	ể 1EC3	ễ 1EC5	ệ 1EC7	ố 1ED1
B−	ồ 1ED3	ổ 1ED5	ỗ 1ED7	Ỡ 1EE0	Ơ 01A0	ộ 1ED9	ờ 1EDD	ở 1EDF	ị 1ECB	Ự 1EF0	Ứ 1EE8	Ừ 1EEA	Ử 1EEC	ơ 01A1	ớ 1EDB	Ư 01AF
C−	À C0	Á C1	Â C2	Ã C3	Ả 1EA2	Ă 0102	ẳ 1EB3	ẵ 1EB5	È C8	É C9	Ê CA	Ẻ 1EBA	Ì CC	Í CD	Ĩ 0128	ỳ 1EF3
D−	Đ 0110	ứ 1EE9	Ò D2	Ó D3	Ô D4	ạ 1EA1	ỷ 1EF7	ừ 1EEB	ử 1EED	Ù D9	Ú DA	ỹ 1EF9	ỵ 1EF5	Ý DD	ỡ 1EE1	ư 01B0
E−	à E0	á E1	â E2	ã E3	ả 1EA3	ă 0103	ữ 1EEF	ẫ 1EAB	è E8	é E9	ê EA	ẻ 1EBB	ì EC	í ED	ĩ 0129	ỉ 1EC9
F−	đ 0111	ự 1EF1	ò F2	ó F3	ô F4	õ F5	ỏ 1ECF	ọ 1ECD	ụ 1EE5	ù F9	ú FA	ũ 0169	ủ 1EE7	ý FD	ợ 1EE3	Ữ 1EEE

[edit] External links

RFC 1456 - Conventions for Encoding the Vietnamese Language
Vietnamese-Standard Working Group
Viet-Std Report 1992
AnGiang Software

v • d • e Character encodings

Morse code • Baudot code • Fieldata • EBCDIC • ASCII • Code page • Unicode

ASCII variants	ATASCII • Galaksija • ISO/IEC 646 • PETSCII • YUSCII • ZX Spectrum character set

Extended ASCII	ArmSCII • TSCII • ISCII • Iran System • ISO/IEC 8859 • ISO/IEC 8859-1 • KOI8 • Mac OS • UTF-8 • VISCII • Windows code pages

ASCII-related	ASCII art • ASCII Ribbon Campaign • Bob Bemer • Braille ASCII • Control characters

Unicode	Universal Character Set • UTF-8 • UTF-16 • UTF-32 • Han unification • GB 18030

Unicode-related	UTF-7 • UTF-EBCDIC • UTF-9 and UTF-18 • TRON

This is an extract from Wikipedia, the Free Encyclopedia