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The term DBCS traditionally refers to a character encoding where each graphic character is encoded in two bytes.. In an 8-bit code, such as Big-5 or Shift JIS, a character from the DBCS is represented with a lead (first) byte with the most significant bit set (i.e., being greater than seven bits), and paired up with a single-byte character-set (SBCS).
SBCS (single-byte character set) DBCS (double-byte character set) TBCS (triple-byte character set) ITU T.61; DEC Radix-50; Cork encoding; Prosigns for Morse code; Telegraph code; TV Typewriter; SI 960 (7-bit Hebrew ISO/IEC 646) Figure space (typographic unit equal to the size of a single typographic figure) Six-bit character code; List of ...
JIS X 0208 prescribes a set of 6879 graphical characters that correspond to two-byte codes with either seven or eight bits to the byte; in JIS X 0208, this is called the kanji set (漢字集合, kanji shūgō), which includes 6355 kanji as well as 524 non-kanji (非漢字, hikanji), including characters such as Latin letters, kana, and so forth.
First byte of a double-byte character, used by JIS X 0208 Not used as first byte, unallocated space in JIS X 0208 First byte of a double-byte IBM extension character First byte of a double-byte IBM-designated user defined character Not used as first byte Second byte of a double-byte character whose first half of the JIS sequence was odd
Microsoft's Shift JIS variant is known simply as "Code page 932" on Microsoft Windows, however this is ambiguous as IBM's code page 932, while also a Shift JIS variant, lacks the NEC and NEC-selected double-byte vendor extensions which are present in Microsoft's variant (although both include the IBM extensions) and preserves the 1978 ordering of JIS X 0208.
The lead bytes for the double-byte characters are "shifted" around the 64 halfwidth katakana characters in the single-byte range 0xA1 to 0xDF. The single-byte characters 0x 00 to 0x7F match the ASCII encoding, except for a yen sign (U+00A5) at 0x5C and an overline (U+203E) at 0x7E in place of the ASCII character set's backslash and tilde ...
It is a double-byte character set (DBCS) somehow similar to Shift JIS, often combined with a MBCS like ASCII. Quite a few vendors as well as official extensions exist, of which ETEN, HKSCS (Hong Kong) and Big5-2003 (as a part of CNS 11643 by Taiwan) are the most well-known ones. [ 6 ]
The full name of the standard is 7-bit and 8-bit double byte coded extended KANJI sets for information interchange (7ビット及び8ビットの2バイト情報交換用符号化拡張漢字集合, Nana-Bitto Oyobi Hachi-Bitto no Ni-Baito Jōhō Kōkan'yō Fugōka Kakuchō Kanji Shūgō). JIS X 0213 has two "planes" (94×94 character tables).