Int 62 Fn 0056  u - Fgdriver V4.02 - "fg_getyjoy" - Get Vertical Position  [V]

   AX = 0056h
   BX = joystick number (0001h or 0002h)

Return: AX = vertical position of joystick
       FFFFh if joystick uninitialized or not present

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)
   The actual coordinates are processor- and joystick-dependent
   You must call "FG_INITJOY" (AX=005Eh) before using this function

See Also: AX=0009h,AX=0052h,AX=005Eh,AX=0062h,AX=0077h