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BBC BASIC VDU Command Parameters Data Sheet
VDU commands mainly relate to the screen. The syntax is VDU n , where n is a number from the table below. Parameters are separated by a comma (,) as indicated. If the value is greater than 255 a semi-colon (;) is needed after the number.
| VDU code | Description |
|---|---|
| VDU 0 | Ignored |
| VDU 1,n | Send byte n to printer |
| VDU 2 | Enable printer |
| VDU 3 | Disable printer |
| VDU 4 | Displays text cursor |
| VDU 5 | Hides text cursor |
| VDU 6 | Enables the VDU |
| VDU 7 | Makes the speaker produce a beep |
| VDU 8 | Move text cursor left one character |
| VDU 9 | Move text cursor right one character |
| VDU 10 | Move text cursor down one row |
| VDU 11 | Move text cursor up one row |
| VDU 12 | Clear text window and move text cursor home |
| VDU 13 | Move text cursor to left of text window |
| VDU 14 | Enable inverse text |
| VDU 15 | Disable inverse text |
| VDU 16 | Clear graphics window |
| VDU 17 | Enable bold text |
| VDU 18 | Disable bold text |
| VDU 19 | Enable underlined text |
| VDU 20 | Disable underlined text |
| VDU 21 | Disables the VDU |
| VDU 22 | Ignored |
| VDU 23 | Ignored |
| VDU 24,lx;by;rx;ty; | Set up a graphics window |
| VDU 25,n,x;y; | Same as PLOTn,x,y |
| VDU 26 | Reset windows, home cursors and reset graphics origin |
| VDU 27,n | Send byte n to the screen as a character |
| VDU 28,lx,by,rx,ty | Set up a text window |
| VDU 29,x;y; | Set the graphics origin |
| VDU 30 | Home the text cursor |
| VDU 31 | Place text cursor at x,y |
| VDU 127 | Delete previous character |
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| © 1997 – 2024 Tim Surtell | Tim's Amstrad NC Users' Site |
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