Extended ASCII

Extended ASCII means an eight-bit character encoding that includes (most of) the seven-bit ASCII characters, plus additional characters. Using the term "extended ASCII" is sometimes criticized,[1][2][3] because it can be mistakenly interpreted to mean that the ASCII standard has been updated to include more characters, or that the term unambiguously identifies a single encoding, neither of which is the case.

Output of the program ascii in Cygwin

There are many extended ASCII encodings (more than 220 DOS and Windows codepages). EBCDIC ("the other" major 8-bit character code) likewise developed many extended variants (more than 186 EBCDIC codepages) over the decades.

Some people call any non-ASCII character in Unicode "extended ASCII". In other contexts only the UTF-8 encoding counts, and in yet other contexts no Unicode encoding is considered extended ASCII.


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