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First Word:
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
VP7 VP6 VP5 VP4 VP3 VP2 VP1 VP0 HP8 HP7 HP6 HP5 HP4 HP3 HP2 001
Second Word:
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
BFD VM6 VM5 VM4 VM3 VM2 VM1 VM0 HM8 HM7 MH6 HM5 HM4 HM3 HM2 000
VPx = vertical beam position
HPx = horizontal beam position
VMx = vertical mask
HMx = horizontal mask
BFD = Blitter Finish Disable (0 = wait until Blitter finished)
if a maskbit is enabled the bit in the first word that belongs to the enabled maskbit is accepted by the copper.
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