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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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