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{{main|C0 and C1 control codes}}
The control code ranges 0x00–0x1F ("C0") and 0x7F originate from the 1967 edition of [[US-ASCII]]. The standard [[ISO/IEC 2022]] (ECMA-35) defines extension methods for ASCII, including a secondary "C1" range of 8-bit control codes from 0x80 to 0x9F, equivalent to 7-bit sequences of {{ctrl|ESC}} with the bytes 0x40 through 0x5F. Collectively, codes in these ranges are known as the [[C0 and C1 control codes]]. Although ISO/IEC 2022 allows for the existence of multiple control code sets specifying differing interpretations of these control codes, their most common interpretation is specified in [[ISO/IEC 6429]] (ECMA-48).
The [[ISO/IEC 8859]] series of encodings conforms to [[ISO/IEC 4873]] (ECMA-43) level 1, a subset of ISO/IEC 2022 designed for 8-bit character encodings, and therefore reserves space for use by a C1 control code set such as ISO/IEC 6429. Unicode inherits its [[Basic Latin (Unicode block)|first]] and [[Latin-1 Supplement (Unicode block)|second]] blocks (comprising U+0000 through U+00FF) from ASCII and [[ISO/IEC 8859-1]], thus incorporating the C0 and C1 control code ranges (U+0000–U+001F, U+007F–U+009F).
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