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Encyclopedia > C0 and C1 control codes

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 00HEX-1FHEX. C1, originally defined in ISO 6429, defines codes in the range 80HEX-9FHEX. The C0 codes are used with 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. In computing, a control character or non-printing character, is a code point (a number) in a character set that does not, in itself, represent a written symbol. ... ISO 646 is an ISO standard that specifies a 7 bit character code from which several national standards are derived, the best known of which is ASCII. Since the portion of ISO 646 shared by all countries specified only the letters used in the English alphabet, other countries using the... In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... The VT100 was a video terminal made by Digital Equipment Corporation (DEC) which became the de facto standard used by terminal emulators. ... There are 95 printable ASCII characters, numbered 32 to 126. ... ISO 8859, more formally ISO/IEC 8859, is a joint ISO and IEC standard for 8-bit character encodings for use by computers. ... Unicode is an industry standard whose goal is to provide the means by which text of all forms and languages can be encoded for use by computers. ...

Contents


C0 (ascii and derivatives)

Seq Dec Hex Abbr Character name Description/notes
^@ 00 0x00 NUL Null Originally used to allow gaps to be left on paper tape for edits. Later used for padding after a code that might take a terminal some time to process (e.g. a carrage return or line feed on a priniting terminal). Now often used as a string terminator, especially in C.
^A 01 0x01 SOH Start of Heading
^B 02 0x02 STX Start of Text
^C 03 0x03 ETX End of Text Often used as a "break" character (Ctrl-C).
^D 04 0x04 EOT End of Transmission Used to represent the end-of-file in Unix. However, MS-DOS uses ^Z for end-of-file.
^E 05 0x05 ENQ Enquiry
^F 06 0x06 ACK Acknowledge
^G 07 0x07 BEL Bell Originally used to sound a bell on the terminal. Later used for a beep on systems that didn't have a physical bell. May also quickly turn on and off reverse video (a visual bell).
^H 08 0x08 BS Backspace Deletes the character to the left and moves the cursor left.
^I 09 0x09 HT Horizontal Tab Generally referred to as simply "tab".
^J 10 0x0A LF Line Feed On typewriters, printers, and some terminal emulators, moves the cursor down one row without affecting its column position. On Unix, used as to mark end-of-line.
^K 11 0x0B VT Vertical Tab
^L 12 0x0C FF Form Feed On printers, load the next page. Treated as whitespace by Python, and may be used to separate logical divisions in code.
^M 13 0x0D CR Carriage Return Originally used to move the cursor to column zero. On Mac OS (pre-Mac OS X), used to mark end-of-line.
^N 14 0x0E SO Shift Out Switch to an alternate character set.
^O 15 0x0F SI Shift In
^P 16 0x10 DLE Data Link Escape Cause the following data to be interpreted as raw data, not control codes.
^Q 17 0x11 DC1 Device Control 1/XOFF Resume transmission. Used for software flow control.
^R 18 0x12 DC2 Device Control 2
^S 19 0x13 DC3 Device Control 3/XON Suspend transmission. Used for software flow control.
^T 20 0x14 DC4 Device Control 4
^U 21 0x15 NAK Negative Acknowledge
^V 22 0x16 SYN Synchronous Idle
^W 23 0x17 ETB End of Transmission Block
^X 24 0x18 CAN Cancel
^Y 25 0x19 EM End of Medium
^Z 26 0x1A SUB Substitute On MS-DOS systems with files opened in text mode, "end of text" or "end of file" is marked by the Ctrl-Z character (code 26, "Substitute"), instead of ^C or ^D common on other operating systems.
^[ 27 0x1B ESC Escape
^ 28 0x1C FS File Separator
^] 29 0x1D GS Group Separator
^^ 30 0x1E RS Record Separator
^_ 31 0x1F US Unit Separator
127 0x7F DEL Rubout/Delete Originally used to mark deleted characters on paper tape, since any character could be changed to all ones by punching holes everywhere. In modern systems, used to delete the character to the right of the cursor.

The null character (also null terminator) is a character with the value zero, present in the ASCII and Unicode character sets, and available in nearly all mainstream programming languages. ... In telecommunication, an end-of-transmission character (EOT) is a transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings. ... Microsofts disk operating system, MS-DOS, was Microsofts implementation of DOS, which was the first popular operating system for the IBM PC, and until recently, was widely used on the PC compatible platform. ... Acknowledge character (ACK): A transmission control character transmitted by the receiving station as an affirmative response to the sending station. ... Bell character is an ASCII control character, code 7 (^G). ... The bells of St Savas A bell is a simple sound-making device. ... Backspace is the keyboard key that originally pushed the typewriter head one position backwards, and in modern computer displays moves the cursor one position backwards and deletes the preceding character. ... Horizontal is an orientation relating to, or in parallel with the horizon, and thus perpendicular to the vertical. ... The tab key on a modern Windows keyboard The tab key on a keyboard is used to advance the cursor to the next tab stop. // Typewriters When a typist wanted to type a table, there was a lot of time-consuming and repetitive use of the space bar and backspace... In computing, line feed (LF) is a control character indicating that one line should be fed out. ... This Smith Premier typewriter, purchased around the end of the 19th century, was found abandoned in the Bodie ghost town. ... A printer can be: Someone who operates a printing press, and prints books. ... An object is in a vertical position when it is aligned in an up-down direction, perpendicular to the horizon. ... The tab key on a modern Windows keyboard The tab key on a keyboard is used to advance the cursor to the next tab stop. // Typewriters When a typist wanted to type a table, there was a lot of time-consuming and repetitive use of the space bar and backspace... In computing, form feed is one of control characters in ASCII.  It forces the printer to eject the current page and to continue printing at the top of another. ... Python is an interpreted programming language created by Guido van Rossum in 1990. ... Originally, carriage return was the term for the key, lever, or mechanism on a typewriter that would cause the cylinder on which the paper was held (the carriage) to return to the left side of the paper after a line of text had been typed, and would often move it... Mac OS, which stands for Macintosh Operating System, is a range of graphical user interface-based operating systems developed by Apple Computer for the Macintosh computers. ... Mac OS X is the operating system which is included with all shipping Apple Macintosh computers in the consumer and professional markets. ... Shift Out (SO) and Shift In (SI) are ASCII control characters 14 and 15, respectively (0xE and 0xF). ... Shift Out (SO) and Shift In (SI) are ASCII control characters 14 and 15, respectively (0xE and 0xF). ... XON/XOFF is communications protocol for controlling the flow of data between computers and other devices. ... The flow control mechanism is used for controlling the flow of data in a network under well-defined conditions, while congestion control is used for controlling the flow of data when congestion has actually occurred . ... XON/XOFF is communications protocol for controlling the flow of data between computers and other devices. ... The flow control mechanism is used for controlling the flow of data in a network under well-defined conditions, while congestion control is used for controlling the flow of data when congestion has actually occurred . ... In telecommunications, a negative-acknowledge character (NAK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up. ... In telecommunication, the term cancel character (CAN) has the following meanings: 1. ... Microsofts disk operating system, MS-DOS, was Microsofts implementation of DOS, which was the first popular operating system for the IBM PC, and until recently, was widely used on the PC compatible platform. ... In computing and telecommunication, an escape character is one which has a special meaning in a sequence of characters. ...

C1 (ISO-8859 and unicode)

Dec Hex Abbr Character name Description/notes
128 0x80 XXX Padding Character
129 0x81 XXX High Octet Preset
130 0x82 BPH Break Permitted Here
131 0x83 NBH No Break Here
132 0x84 IND Index
133 0x85 NEL Next Line Used to mark end-of-line on some IBM mainframes.
134 0x86 SSA Start of Selected Area
135 0x87 ESA End of Selected Area
136 0x88 HTS Horizontal Tab Set
137 0x89 HTJ Horizontal Tab Justified
138 0x8A VTS Vertical Tab Set
139 0x8B PLD Partial Line Forward
140 0x8C PLU Partial Line Backward
141 0x8D RI Reverse Line Feed
142 0x8E SS2 Single-Shift 2
143 0x8F SS3 Single-Shift 3
144 0x90 DCS Device Control String
145 0x91 PU1 Private Use 1
146 0x92 PU2 Private Use 2
147 0x93 STS Set Transmit State
148 0x94 CCH Cancel character
149 0x95 MW Message Waiting
150 0x96 SPA Start of Protected Area
151 0x97 EPA End of Protected Area
152 0x98 SOS Start of String
153 0x99 XXX Single Graphic Char Intro
154 0x9A SCI Single Char Intro
155 0x9B CSI Control Sequence Intro
156 0x9C ST String Terminator
157 0x9D OSC OS Command
158 0x9E PM Private Message
159 0x9F APC App Program Command

In telecommunication, the term cancel character (CAN) has the following meanings: 1. ...

References


 
 

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