Difference between revisions of "SYSTEM INT1"

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(SYSTEM_INT1 ($C00438): Multi-purpose VBL call)
m (SYSTEM_INT1 ($C00438): Multi-purpose VBL call)
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== [[SYSTEM_INT1]] ($C00438): Multi-purpose VBL call ==
 
== [[SYSTEM_INT1]] ($C00438): Multi-purpose VBL call ==
  
The SYSTEM_INT1 bios calls is the BIOS vblank interrupt routines.
+
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).