The C0 and C1
control code sets define control codes for use in text. C0, originally defined in
ISO 646, defines codes in the range 00
HEX–1FHEX. C1, originally defined in
ISO 6429, defines codes in the range 80HEX–9FHEX. The C0 codes are contained in
ASCII and most encodings based on it. The C1 codes were included in the
ISO-8859-n series of encodings and
Unicode but are rarely used. When they turn up in documents, Web pages, e-mail messages, etc., which are ostensibly in an ISO-8859-n encoding, their code positions were reused to refer to the characters at that position in a proprietary, system-specific encoding such as
Windows-1252 or the
Apple Macintosh ("
MacRoman") character set.
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