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In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...
Initially defined as part of ASCII, the default C0 control code set is now defined in ISO 6429 (ECMA-48), making it part of the same standard as the C1 set invoked by the ANSI escape sequences (although ISO 2022 allows the ISO 6429 C0 set to be used without the ISO 6429 C1 set, and vice versa, provided that 0x1B is always ESC). This is used to ...
All entries in the ASCII table below code 32 10 (technically the C0 control code set) are of this kind, including CR and LF used to separate lines of text. The code 127 10 is also a control character. [1] [2] Extended ASCII sets defined by ISO 8859 added the codes 128 10 through 159 10 as control characters. This was primarily done so that if ...
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 ESC with the bytes 0x40 through 0x5F.
The C0 Controls, referred to as C0 ASCII control codes in version 1.0, are inherited from ASCII and other 7-bit and 8-bit encoding schemes. The Alias names for C0 controls are taken from the ISO/IEC 6429:1992 standard.
The C1 controls subheading contains 32 supplementary control codes inherited from ISO/IEC 8859-1 and many other 8-bit character standards. The alias names for the C0 and C1 control codes are taken from ISO/IEC 6429:1992 .
The semantics for the few control codes to which semantics are assigned, and the character name aliases, came from ISO 6429. C0 and C1 control codes § Unicode uses section 23.1 "Control Codes" of the Unicode specification as a reference. Guy Harris 01:06, 30 May 2024 (UTC)
Control character sets are classified as "primary" or "secondary" control code sets, [43] respectively also called "C0" and "C1" control code sets. [44] A C0 control set must contain the ESC (escape) control character at 0x1B [45] (a C0 set containing only ESC is registered as ISO-IR-104), [46] whereas a C1 control set may not contain the ...