Chapter 4. Coded Character Sets And Encodings in the World
33
4.5.8 HKSCS
HKSCS is an expansion and amendment of GCCS. It includes 4702 characters. It means Hong
Kong Supplementary Character Set.
In addition to a usage in User Defined Area in Big5, HKSCS defines a usage in Private Use Area
in Unicode.
4.5.9 Shift JIS
Shift JIS is one of popular encodings in Japan. Its CCS are JISX 0201 Roman, JISX 0201 Kana, and
JISX 0208.
JISX 0201 Roman is Japanese version of ISO 646. It defines yen currency mark for
0x5c
, where
ASCII has backslash.
0xa1
0xdf
is one byte character and is JISX 0201 Kana. Two byte character
(the first byte:
0x81
0x9f
and
0xe0
0xef
; the second byte:
0x40
0x7e
and
0x80
0xfc
) is
JISX 0208.
Japanese version of MS DOS, MS Windows and Macintosh use this encoding, though this encod 
ing is not often used in POSIX systems.
4.5.10 VISCII
Vietnamese language uses 186 characters (Latin alphabets with accents) and other symbols. It is a
bit more than the limit of ISO 8859 like encoding.
VISCII is a standard for Vietnamese. It is upward compatible with ASCII. It is 8bit and stateless,
like ISO 8859 series. However, it uses code points of not only
0x21
0x7e
and
0xa0
0xff
but also
0x02
,
0x05
,
0x06
,
0x14
,
0x19
,
0x1e
, and
0x80
0x9f
. This makes VISCII not ISO
2022 compliant.
Vietnam has a new, ISO 2022 compliant character set TCVN 5712 VN2 (aka VSCII). In TCVN
5712 VN2, accented characters are expressed as a combined character. Note that some of accented
characters have their own code points.
4.5.11 TRON
TRON (
http://www.tron.org/index e.html
) is a project to develop a new operating sys 
tem, founded as a collaboration of industries and academics in Japan since 1984.
The most diffused version of TRON operating system families is ITRON, a real time OS for embed 
ded systems. However, our interest is not on ITRON now. TRON determines a TRON encoding.






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