SYSTEM INT1: Difference between revisions
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== [[SYSTEM_INT1]] ($C00438): Multi-purpose VBL call == | == [[SYSTEM_INT1]] ($C00438): Multi-purpose VBL call == | ||
The SYSTEM_INT1 | The SYSTEM_INT1 is the BIOS vblank interrupt routine. | ||
It will call [[MESS_OUT]] and [[SYSTEM_IO]] | It will call [[MESS_OUT]] and [[SYSTEM_IO]] | ||
Revision as of 05:59, 21 October 2012
SYSTEM_INT1 ($C00438): Multi-purpose VBL call
The SYSTEM_INT1 is the BIOS vblank interrupt routine.
It will call MESS_OUT and SYSTEM_IO
It has it's own frame counter (BIOS_INT1_FRAME_COUNTER, $10FDD4) and a flag to skip MESS_OUT and SYSTEM_IO (BIOS_INT1_SKIP, $10FEE3).