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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 ...
Non printable ASCII character Unaltered ASCII character Modified ASCII character Single-byte half-width katakana 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
Each character was displayed as a small dot matrix, often about 8 pixels wide, and a SBCS (single-byte character set) was generally used to encode characters of Western languages. For aesthetic reasons and readability, it is preferable for Chinese characters to be approximately square-shaped, therefore twice as wide as these fixed-width SBCS ...
Modified ASCII character Single-byte half-width katakana First byte of a double-byte JIS X 0208 character Unused as first byte of a JIS X 0208 character Second byte of a double-byte JIS X 0208 character whose first half of the JIS sequence was odd Second byte of a double-byte JIS X 0208 character whose first half of the JIS sequence was even
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 ...
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).