&FCB0 PRISMA video system 0 reserved 1 horizontal line phase 2 frame grab black level and gain 3 frame grab and control output register 4 palette control 5 palette address 6 window/background delay trims 7 overlay/NVM page 8 HD63484 ACRTC address/status 9 HD63484 ACRTC data A control/status B palette data C overlay data D overlay address/ACRTC data read E NVR data F reserved for control in multiple PRISMA systems