SYSTEM INT1

From NeoGeo Development Wiki
Jump to navigation Jump to search

SYSTEM_INT1 ($C00438): Multi-purpose VBL call

The SYSTEM_INT1 bios calls is the BIOS vblank interrupt routines.

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).