Offset: $1DC Access: write Chipset: ECS/AGA
Selects fixed or programmable beam timing and sync/blanking controls.
Bitfields¶
Bit 14: HARDDIS.
Bit 13: LPENDIS.
Bit 12: VARVBEN.
Bit 11: LOLDIS.
Bit 10: CSCBEN.
Bit 9: VARVSYEN.
Bit 8: VARHSYEN.
Bit 7: VARBEAMEN, use programmable beam totals.
Bit 6: DUAL (UHRES dual mode is not emulated).
Bit 5: PAL, select PAL rather than NTSC timing.
Bit 4: VARCSYEN, programmable composite-sync output enable.
Bit 3: BLANKEN.
Bit 2: CSYTRUE, composite-sync pin polarity.
Bit 1: VSYTRUE, vertical-sync pin polarity.
Bit 0: HSYTRUE, horizontal-sync pin polarity.
Copperline models beam, blanking, and light-pen controls. With VARBEAMEN set, VARHSYEN and VARVSYEN enable sync windows used by display presentation and beam traces. Composite-sync routing and sync-pin polarities are latched; physical sync/genlock output is not emulated.