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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.
For example, a non-registered custom variant of code page 437 (1B5h) or 28591 (6FAF) could become 57781 (E1B5h) or 61359 (EFAFh), respectively, in order to avoid potential conflicts with other assignments and maintain the sometimes existing internal numerical logic in the assignments of the original code pages.
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.
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), [23] [24] 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.
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- When you enter a character in code page 437, the graphical representation will be used, as noted above. On a lot of computers 437 is the OEM code page. - Other code pages may not have graphical glyphs in the 1...31 range. The edit control interprets some control codes specially and ignores/swallows the rest (to the best of my knowledge).
So-called "block ASCII" or "high ASCII" uses the extended characters of the 8-bit code page 437, which is a proprietary standard introduced by IBM in 1979 (ANSI Standard x3.16) for the IBM PC DOS and MS-DOS operating systems. "Block ASCIIs" were widely used on the PC during the 1990s until the Internet replaced BBSes as the main communication ...