clear_joy_events
From ArchaicPixels: HuC and PCEAS Documentation
clear_joy_events(char mask);
Reset the joypad keypress event list(s).
'mask' indicates which joypad event list you want
to reset. One bit for each joypad, bit 0 is joypad 0,
bit 1 is joypad 1, etc... All the event lists
can be reset by setting 'mask' to 0x1F.
