Bits 0-3 Action
0 Replace colour on screen
1 OR the colour on screen
2 AND the colour on screen
3 EOR the colour on screen
4 NOT the colour on screen
5 Leave colour on screen
6 BIC the colour on screen
7 OR NOT colour on screen
If bit 3 is set, ie the range from 8 to 15, the lower bits mean the same, but background colour is transparent.
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