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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).
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.
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 ...
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 ...
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
First-generation Japanese MSX models used a character set extended from the JIS X 0201 standard (which provided basic single-byte Roman and katakana characters), [3] [4] with hiragana, a few common kanji (accessed via the "graph" key), and various geometric symbols filling in the otherwise-unspecified codepoints.
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.
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 ]