Int 62 Fn 0009  u - Fgdriver V3.03+ - "fg_button" - Get Joystick Button S  [V]

   AX = 0009h
   BX = joystick number (0001h or 0002h)

Return: AX = button states
       bit 0: top button pressed
       bit 1: bottom button pressed

Note:  the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145)

See Also: AX=0052h,AX=0056h,AX=005Eh,AX=0062h,AX=0077h