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A double-byte character set (DBCS) is a character encoding in which either all characters (including control characters) are encoded in two bytes, or merely every graphic character not representable by an accompanying single-byte character set is encoded in two bytes (Han characters would generally comprise most of these two-byte characters).
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]
JIS X 0208 is a 2-byte character set specified as a Japanese Industrial Standard, containing 6879 graphic characters suitable for writing text, place names, personal names, and so forth in the Japanese language.
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.
Further, though JIS X 0201 is a single-byte encoding (and displayed at half-width) and JIS X 0208 is a double-byte encoding (and displayed at full-width), there is no connection between number of bytes and width (other than those corresponding in Shift JIS, as above) – for example, Unicode can be encoded with four bytes to display both full ...
Under double-byte character set Windows environments, specifying this font may also cause applications to use non-System fonts when displaying texts. In Windows 2000 or later, changing script setting in some application's font dialogue (e.g. Notepad, WordPad) causes the font to look completely different, even under same font size. Similarly ...
The Big5 family of character encodings start with the initial definition by the consortium of five companies in Taiwan that developed it. [5] It is a double-byte character set (DBCS) somehow similar to Shift JIS, often combined with a MBCS like ASCII.