SYSTEM INT1: Difference between revisions
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m (Created page with "== BIOSF_VBL ($C0044A): Multiple purpose VBL routine == Sets values in RAM according to buttons states, checks CDDA commands, probably other things... Always (?) called each…") |
m (moved BIOSF VBL to SYSTEM INT1: rename page according to official SNK doc) |
(No difference)
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Revision as of 13:58, 26 June 2011
BIOSF_VBL ($C0044A): Multiple purpose VBL routine
Sets values in RAM according to buttons states, checks CDDA commands, probably other things... Always (?) called each frame by games.
Memory locations set (all 8bit):
BIOS_P1CURRENT $10FD95 Joystick 1 state BIOS_P1PREVIOUS $10FD96 Previous joystick 1 state BIOS_P1CHANGE $10FD97 Joystick 1 state change (edges) BIOS_P1REPEAT $10FD98 Joystick 1 repeat (edge, and strobe if held more than ? calls) BIOS_P2CURRENT $10FD9B Joystick 2 state BIOS_P2PREVIOUS $10FD9C Previous joystick 2 state BIOS_P2CHANGE $10FD9D Joystick 2 state change (edges) BIOS_P2REPEAT $10FD9E Joystick 2 repeat (edge, and strobe if held more than ? calls) BIOS_STATCURNT Joystick 1/2 start/select state BIOS_STATCHANGE Previous Joystick 1/2 start/select state
Bit definitions: see Joypad