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( => ( => ( => Vietnamese Standard Code for Information Interchange [pageid] => 503143 ) =>

The Vietnamese Standard Code for Information Interchange (VISCII) is a "character set comprising the "Vietnamese alphabet, "punctuation, and other "graphemes.

A traditional "extended ASCII character set consists of up to 128 characters to the ASCII set. Vietnamese requires 134 additional letter-diacritic combinations, which is six too many. There are essentially three different ways to handle this problem:

  1. Use "variable-width encoding
  2. Use "combining diacritical marks, as "Windows-1258 does
  3. Replace six of the basic ASCII "control characters

VISCII went for the last option, replacing six 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 six of the least-used uppercase letter-diacritic combinations. While this option may cause programs that use those control codes to malfunction when handling VISCII text, it creates fewer complications than the other two options. However, using up all the extended "code points for accented letters left no room to add useful symbols, superscripted numbers, curved quotes, proper dashes, etc., like most other extended ASCII character sets.

VISCII was designed by the Vietnamese Standardization Working Group (Viet-Std Group) based in the Silicon Valley in California in 1992 while they were working with the Unicode consortium to include precomposed Vietnamese characters in the Unicode standard.

VISCII was fully supported by the TriChlor Software Group in "California, which released a lot of software packages, libraries, and fonts for MS-DOS and Windows, Unix, and Macintosh. However, it, along with other Vietnamese-specific character sets, fell out of usage after the adoption of "Unicode. VISCII-compliant software is still available at many ftp sites.

Contents

Code page layout[edit]

VISCII
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
 
0_
 
"NUL
0000
0
"SOH
0001
1
"
1EB2
2
"ETX
0003
3
"EOT
0004
4
"
1EB4
5
"
1EAA
6
"BEL
0007
7
"BS
0008
8
"HT
0009
9
"LF
000A
10
"VT
000B
11
"FF
000C
12
"CR
000D
13
"SO
000E
14
"SI
000F
15
 
1_
 
"DLE
0010
16
"DC1
0011
17
"DC2
0012
18
"DC3
0013
19
"
1EF6
20
"NAK
0015
21
"SYN
0016
22
"ETB
0017
23
"CAN
0018
24
"
1EF8
25
"SUB
001A
26
"ESC
001B
27
"FS
001C
28
"GS
001D
29
"
1EF4
30
"US
001F
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
"DEL
007F
127
 
8_
 
"
1EA0
128
"
1EAE
129
"
1EB0
130
"
1EB6
131
"
1EA4
132
"
1EA6
133
"
1EA8
134
"
1EAC
135
"
1EBC
136
"
1EB8
137
"
1EBE
138
"
1EC0
139
"
1EC2
140
"
1EC4
141
"
1EC6
142
"
1ED0
143
 
9_
 
"
1ED2
144
"
1ED4
145
"
1ED6
146
"
1ED8
147
"
1EE2
148
"
1EDA
149
"
1EDC
150
"
1EDE
151
"
1ECA
152
"
1ECE
153
"
1ECC
154
"
1EC8
155
"
1EE6
156
"Ũ
0168
157
"
1EE4
158
"
1EF2
159
 
A_
 
"Õ
00D5
160
"
1EAF
161
"
1EB1
162
"
1EB7
163
"
1EA5
164
"
1EA7
165
"
1EA9
166
"
1EAD
167
"
1EBD
168
"
1EB9
169
"ế
1EBF
170
"
1EC1
171
"
1EC3
172
"
1EC5
173
"
1EC7
174
"
1ED1
175
 
B_
 
"
1ED3
176
"
1ED5
177
"
1ED7
178
"
1EE0
179
"Ơ
01A0
180
"
1ED9
181
"
1EDD
182
"
1EDF
183
"
1ECB
184
"
1EF0
185
"
1EE8
186
"
1EEA
187
"
1EEC
188
"ơ
01A1
189
"
1EDB
190
"Ư
01AF
191
 
C_
 
"À
00C0
192
"Á
00C1
193
"Â
00C2
194
"Ã
00C3
195
"
1EA2
196
"Ă
0102
197
"
1EB3
198
"
1EB5
199
"È
00C8
200
"É
00C9
201
"Ê
00CA
202
"
1EBA
203
"Ì
00CC
204
"Í
00CD
205
"Ĩ
0128
206
"
1EF3
207
 
D_
 
"Đ
0110
208
"
1EE9
209
"Ò
00D2
210
"Ó
00D3
211
"Ô
00D4
212
"
1EA1
213
"
1EF7
214
"
1EEB
215
"
1EED
216
"Ù
00D9
217
"Ú
00DA
218
"
1EF9
219
"
1EF5
220
"Ý
00DD
221
"
1EE1
222
"ư
01B0
223
 
E_
 
"à
00E0
224
"á
00E1
225
"â
00E2
226
"ã
00E3
227
"
1EA3
228
"ă
0103
229
"
1EEF
230
"
1EAB
231
"è
00E8
232
"é
00E9
233
"ê
00EA
234
"
1EBB
235
"ì
00EC
236
"í
00ED
237
"ĩ
0129
238
"
1EC9
239
 
F_
 
"đ
0111
240
"
1EF1
241
"ò
00F2
242
"ó
00F3
243
"ô
00F4
244
"õ
00F5
245
"
1ECF
246
"
1ECD
247
"
1EE5
248
"ù
00F9
249
"ú
00FA
250
"ũ
0169
251
"
1EE7
252
"ý
00FD
253
"
1EE3
254
"
1EEE
255
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F

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Further reading[edit]

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