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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).
As these were typically encoded in a DBCS (double-byte character set), this also meant that their width on screen in a duospaced font was proportional to their byte length. Some terminals and editing programs could not deal with double-byte characters starting at odd columns, only even ones (some could not even put double-byte and single-byte ...
It is used in the mapping of some IBM encodings for Korean, such as IBM code page 933, which allows the use of the Shift Out and Shift In characters to shift to a double-byte character set. [5] Since the double-byte character set could contain compatibility jamo, halfwidth variants are needed to provide round-trip compatibility. [6] [7]
The Unicode standard does not specify or create any font (), a collection of graphical shapes called glyphs, itself.Rather, it defines the abstract characters as a specific number (known as a code point) and also defines the required changes of shape depending on the context the glyph is used in (e.g., combining characters, precomposed characters and letter-diacritic combinations).
A duospaced font (also called a duospace font) is a fixed-width font whose letters and characters occupy either of two integer multiples of a specified, fixed horizontal space. Traditionally, this means either a single or double character width, [ 1 ] although the term has also been applied to fonts using fixed character widths with another ...
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 ...
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 ...
It comprises single byte code page 1114 (CCSID 5210) and double byte code page 947 (CCSID 21427). [19] [20] [21] For better compatibility with Microsoft's variant in IBM Db2, IBM also define the pure double-byte code page 1372 [22] and the associated variable-width CCSID 1373, which corresponds to Microsoft's code page 950. [23]