C0 and C1 control codes

(Redirected from C0)

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-1F_HEX. C1, originally defined in ISO 6429, defines codes in the range 80_HEX-9F_HEX. 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.

1 C0 (ascii and derivatives)
2 C1 (ISO-8859 and unicode)
3 References

[edit]

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.

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C1 (ISO-8859 and unicode)

Dec	Hex	Abbr	Character name	Description/notes
128	0x80	PAD	Padding Character
129	0x81	HOP	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	SGCI	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

[edit]

C0 and C1 control codes

Contents

C0 (ascii and derivatives)

C1 (ISO-8859 and unicode)

References