VISCII stands for Vietnamese Standard Code for Information Interchange. It is a character set designed to represent Vietnamese texts. Vietnamese requires slightly too many (134) letter/diacritic combinations make a traditional extended ascii character set for it. There are essentially 3 possible solutions to this. A character encoding is a code that pairs a set of characters (such as an alphabet or syllabary) with a set of something else, such as numbers or electrical pulses. ... The term extended ASCII (or high ASCII) describes eight-bit or larger character encodings that include the standard seven-bit ASCII characters as well as others. ...
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. Combining diacritical marks are Unicode characters that are intended to modify other characters (see Diacritic). ... Windows-1258 is a codepage used in Microsoft Windows to represent Vietnamese texts. ... The C0 and C1 control code sets define control codes for use in text. ...
Codepage layout
.0
.1
.2
.3
.4
.5
.6
.7
.8
.9
.A
.B
.C
.D
.E
.F
0.
NUL 0
SOH 1
Ẳ 1EB2
ETX 3
EOT 4
Ẵ 1EB4
Ẫ 1EAA
BEL 7
BS 8
HT 9
LF A
VT B
FF C
CR D
SO E
SI F
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.
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 168
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 1A0
ộ 1ED9
ờ 1EDD
ở 1EDF
ị 1ECB
Ự 1EF0
Ứ 1EE8
Ừ 1EEA
Ử 1EEC
ơ 1A1
ớ 1EDB
Ư 1AF
C.
À C0
Á C1
 C2
à C3
Ả 1EA2
Ă 102
ẳ 1EB3
ẵ 1EB5
È C8
É C9
Ê CA
Ẻ 1EBA
Ì CC
Í CD
Ĩ 128
ỳ 1EF3
D.
Đ 110
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 1B0
E.
à E0
á E1
â E2
ã E3
ả 1EA3
ă 103
ữ 1EEF
ẫ 1EAB
è E8
é E9
ê EA
ẻ 1EBB
ì EC
í ED
ĩ 129
ỉ 1EC9
F.
đ 111
ự 1EF1
ò F2
ó F3
ô F4
õ F5
ỏ 1ECF
ọ 1ECD
ụ 1EE5
ù F9
ú FA
ũ 169
ủ 1EE7
ý FD
ợ 1EE3
Ữ 1EEE
External links
RFC 1456 - Conventions for Encoding the Vietnamese Language
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