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Code page 437 (CCSID 437) is the character set of the original IBM PC (personal computer). [2] It is also known as CP437, OEM-US, OEM 437, [ 3 ] PC-8, [ 4 ] or DOS Latin US. [ 5 ] The set includes all printable ASCII characters as well as some accented letters ( diacritics ), Greek letters, icons, and line-drawing symbols.
A separate suite of code pages was implemented not only due to compatibility, but also because the fonts of VGA (and descendant) hardware suggest encoding of line-drawing characters to be compatible with code page 437. Most OEM code pages share many code points, particularly for non-letter characters, with the second (non-ASCII) half of CP437.
Code page. In computing, a code page is a character encoding and as such it is a specific association of a set of printable characters and control characters with unique numbers. Typically each number represents the binary value in a single byte. (In some contexts these terms are used more precisely; see Character encoding § Terminology .)
The hardware code page of the original IBM PC supplied the following box-drawing characters, in what DOS now calls code page 437. This subset of the Unicode box-drawing characters is thus included in WGL4 and is far more popular and likely to be rendered correctly:
In many English-speaking countries, the primary code page is either 437 (f.e. in the US) or 850 (f.e. in the UK, Ireland and Canada), so that, without specifying a different code page, the system would often assume one of these to be the corresponding device's default hardware code page as well.
Code page 1108 (DITROFF Base Compatibility) is an extension of this codepage which alters some code points in the range 0–32 from their definitions in Code page 437. [20] DITROFF (device independent troff) is an intermediate format of the standard Unix text formatter Troff .
The familiar Alt+### combination (where ### is from 0 to 255) retains the old MS-DOS behavior, i.e., generates characters from the legacy code pages now called "OEM code pages." For instance, the combination Alt + 1 6 3 would result in ú (Latin letter u with acute accent ) which is at 163 in the OEM code page of CP437 or CP850. [ 2 ]
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