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www.riscos.com Technical Support: |
| VDU Code | Ctrl | Extra bytes | Meaning |
|---|---|---|---|
| 0 | @ | 0 | Does nothing |
| 1 | A | 1 | Sends next character to printer only |
| 2 | B | 0 | Enables printer |
| 3 | C | 0 | Disables printer |
| 4 | D | 0 | Writes text at text cursor |
| 5 | E | 0 | Writes text at graphics cursor |
| 6 | F | 0 | Enables VDU driver |
| 7 | G | 0 | Generates bell sound |
| 8 | H | 0 | Moves cursor back one character (or deletes previous character) |
| 9 | I | 0 | Moves cursor on one space |
| 10 | J | 0 | Moves cursor down one line |
| 11 | K | 0 | Moves cursor up one line |
| 12 | L | 0 | Clears text window |
| 13 | M | 0 | Moves cursor to start of current line |
| 14 | N | 0 | Turns on page mode |
| 15 | O | 0 | Turns off page mode |
| 16 | P | 0 | Clears graphics window |
| 17 | Q | 1 | Defines text colour |
| 18 | R | 2 | Defines graphics colour |
| 19 | S | 5 | Defines logical colour |
| 20 | T | 0 | Restores default logical colours |
| 21 | U | 0 | Disables VDU drivers (or deletes current line) |
| 22 | V | 1 | Selects screen mode |
| 23 | W | 9 | Multi-purpose command |
| 24 | X | 8 | Defines graphics window |
| 25 | Y | 5 | PLOT command |
| 26 | Z | 0 | Restores default windows |
| 27 | [ | 0 | Does nothing |
| 28 | \ | 4 | Defines text window |
| 29 | ] | 4 | Defines graphics origin |
| 30 | ^ | 0 | Homes text cursor |
| 31 | _ | 2 | Moves text cursor |
For more details of VDU commands see the chapter entitled VDU Control.