The Control Characters
The first 32 values are non-printing
control characters, such as Return and Line feed. You
generate these characters on the keyboard by holding down the Control key while
you strike another key. For example, Bell is value 7, Control plus G, often
shown in documents as ^G. Notice that 7 is 64 less than the value of G (71); the
Control key subtracts 64 from the value of the keys that it modifies.
For the text version of the following tables, click Control Characters and Printing Characters.
Control Characters
| Char | Oct | Dec | Hex | Control-Key | Control Action |
|---|---|---|---|---|---|
| NUL | 0 | 0 | 0 | ^@ | Null character |
| SOH | 1 | 1 | 1 | ^A | Start of heading, = console interrupt |
| STX | 2 | 2 | 2 | ^B | Start of text, maintenance mode on HP console |
| ETX | 3 | 3 | 3 | ^C | End of text |
| EOT | 4 | 4 | 4 | ^D | End of transmission, not the same as ETB |
| ENQ | 5 | 5 | 5 | ^E | Enquiry, goes with ACK; old HP flow control |
| ACK | 6 | 6 | 6 | ^F | Acknowledge, clears ENQ logon hand |
| BEL | 7 | 7 | 7 | ^G | Bell, rings the bell... |
| BS | 10 | 8 | 8 | ^H | Backspace, works on HP terminals/computers |
| HT | 11 | 9 | 9 | ^I | Horizontal tab, move to next tab stop |
| LF | 12 | 10 | a | ^J | Line Feed |
| VT | 13 | 11 | b | ^K | Vertical tab |
| FF | 14 | 12 | c | ^L | Form Feed, page eject |
| CR | 15 | 13 | d | ^M | Carriage Return |
| SO | 16 | 14 | e | ^N | Shift Out, alternate character set |
| SI | 17 | 15 | f | ^O | Shift In, resume defaultn character set |
| DLE | 20 | 16 | 10 | ^P | Data link escape |
| DC1 | 21 | 17 | 11 | ^Q | XON, with XOFF to pause listings; ":okay to send". |
| DC2 | 22 | 18 | 12 | ^R | Device control 2, block-mode flow control |
| DC3 | 23 | 19 | 13 | ^S | XOFF, with XON is TERM=18 flow control |
| DC4 | 24 | 20 | 14 | ^T | Device control 4 |
| NAK | 25 | 21 | 15 | ^U | Negative acknowledge |
| SYN | 26 | 22 | 16 | ^V | Synchronous idle |
| ETB | 27 | 23 | 17 | ^W | End transmission block, not the same as EOT |
| CAN | 30 | 24 | 17 | ^X | Cancel line, MPE echoes !!! |
| EM | 31 | 25 | 19 | ^Y | End of medium, Control-Y interrupt |
| SUB | 32 | 26 | 1a | ^Z | Substitute |
| ESC | 33 | 27 | 1b | ^[ | Escape, next character is not echoed |
| FS | 34 | 28 | 1c | ^\ | File separator |
| GS | 35 | 29 | 1d | ^] | Group separator |
| RS | 36 | 30 | 1e | ^^ | Record separator, block-mode terminator |
| US | 37 | 31 | 1f | ^_ | Unit separator |
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