VDU 18
Programmer's Reference Manuals
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» VDU 18
VDU 18 (&12)
Use
Defines graphics foreground and background colours. Identical in use to BASIC statement GCOL.
Syntax
VDU 18,plotmode,col
Parameters
| plotmode | 0|1|2|3|4 |
| col | Colour |
Notes
Plotmode specifies how the colour is to be placed on the screen, as tabulated below.
Colour reference is the logical colour, which may differ to the actual colour.
| Plotmode | Action |
|---|---|
| 0 | Plot the colour specified |
| 1 | OR the specified colour with that already there |
| 2 | AND the specified colour with that already there |
| 3 | EOR (Exclusive-OR) the specified colour with that already there |
| 4 | Invert the colour already there |
See also
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