C1 controls

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File Format
Name C1 controls

The C1 controls are the control characters (code positions 128-159 decimal) which are defined by ISO/IEC 6429:1992 and are part of the ISO-8859 encoding. They are also part of a number of other character sets derived from ASCII. They are not often used, and in otherwise equivalent Microsoft character sets (e.g., Windows 1252) they are replaced by printing characters.

NOTE: I'm cloning this from the C0 article and saving it occasionally. There will be gross errors till I'm done. Bear with me or dive in. --Gmcgath (talk) 12:34, 30 November 2012 (UTC)

Hex Dec Abbreviation Name Description and uses
80 128 PAD Padding Character Not part of ISO/IEC 6429.
81 129 HOP High Octet Preset Not part of ISO/IEC 6429.
82 130 BPH Break Permitted Here Follows a graphic character where a line break is permitted.
83 131 NBH No Break Here Follows a graphic character where a line break is not permitted.
84 132 IND Index Moves the active position one line down.
85 133 NEL Next Line Yet another line ending.
86 134 SSA Start of Selected Area
87 135 ESA End of Selected Area
88 136 HTS Horizontal Tabulation Set Sets a horizontal tab stop.
89 137 HTJ Horizontal Tabulation with Justification Sets a horizontal tab stop and indicates text should be justified out to the stop.
8A 138 VTS Vertical Tabulation Set Sets a vertical tab stop.
8B 139 PLD Partial Line Down Moves the active position down to a position suitable for subscripts, or undoes PLU.
8C 140 PLU Partial Line Up Moves the active position up to a position suitable for superscripts, or undoes PLD.
8D 141 RI Reverse Index Moves the active position one line up.
8E 142 SS2 Single-Shift 2 Indicates that the next code only should be interpreted in the G2 character set.
8F 143 SS3 Single-Shift 3 Indicates that the next code only should be interpreted in the G3 character set.
90 144 DCS Device Control String Introduces a device control sequence, which is terminated by ST (0X96).
91 145 PU1 Private Use 1
92 146 PU2 Private Use 2
93 147 STS Set Transmit State The third of the device-control codes; this one (CTRL-S, also known as XOFF) is often used to pause processes, devices, or output streams, with CTRL-Q (XON) resuming them (though in some cases, any keypress causes output to resume).
94 148 PCH Cancel Character The fourth device-control code; not used as much as DC1 or DC3. In DEC TOPS-20 mainframes, usually resulted in output of system status to terminal.
95 149 MW Message Waiting In transmission protocols, indicates a failure requiring a re-send, or a negative response to a query of whether the process is ready to proceed.
96 150 SPA Start of Protected Area Signals that a correction may now be received in synchronous transmission protocols.
97 151 EPA End of Protected Area Marks the end of a block of data divided into blocks for transmission.
98 152 SOS Start of String Cancels an operation and signals that previously-sent data can be disregarded.
99 153 SGCI Single Graphic Character Introducer Marks the end of a physical medium such as a data-storage tape.
9A 154 SCI Single Character Introducer Used to mark the spot where garbled, missing, or incomplete characters were received due to transmission errors, or various other uses involving place-holder characters. This character (Ctrl-Z) is also used by MS/PC-DOS to mark the end of a file or input stream, calling it EOF (although CTRL-D, EOT, would have been more standards-compliant and is used by Unix-style OSs for this purpose; however, some DEC operating systems used the CTRL-Z convention and this is what was followed by PC-DOS).
9B 155 CSI Control Sequence Introducer Mapped onto the ESC key on keyboards, this usually signals a user attempting to exit a menu or mode. It is also commonly used in printer and terminal control protocols to signal the beginning of a special "escape sequence" where immediately-following characters are interpreted as commands.
9C 156 ST Operating System Command Introduces an operating system command, which is terminated by ST (0X96).
9D 157 OSC Group Separator The second of four separator characters, subordinate to FS, but higher-level than RS and US.
9E 158 PM Privacy Message Introduces a privacy message, which is terminated by ST (0X96).
9F 159 APC Application Program Command Introduces an application program command, which is terminated by ST (0X96).
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