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 is the | The SYSTEM_INT1 call is the [[system ROM]]'s v-blank [[68k interrupts|interrupt]] routine. | ||
It will call [[MESS_OUT]] and [[SYSTEM_IO]] | It will call [[MESS_OUT]] and [[SYSTEM_IO]]. | ||
It has | It has its own frame counter (BIOS_INT1_FRAME_COUNTER, $10FDD4) and a flag to skip [[MESS_OUT]] and [[SYSTEM_IO]] (BIOS_INT1_SKIP, $10FEE3). | ||
[[Category:BIOS calls]] | [[Category:BIOS calls]] | ||
Latest revision as of 05:28, 28 February 2017
SYSTEM_INT1 ($C00438): Multi-purpose VBL call
The SYSTEM_INT1 call is the system ROM's v-blank interrupt routine.
It will call MESS_OUT and SYSTEM_IO.
It has its own frame counter (BIOS_INT1_FRAME_COUNTER, $10FDD4) and a flag to skip MESS_OUT and SYSTEM_IO (BIOS_INT1_SKIP, $10FEE3).