NAME
        GPD_ASKCTYPE -- Acquire the current game port controller type

   FUNCTION
        This command identifies the type of controller at the game
        port, so that the signals at the port may be properly
        interpreted.  The controller type has been set by a previous
        SetCType.

        This command always executes immediately.

   IO REQUEST
        io_Message      mn_ReplyPort set if quick I/O is not possible
        io_Device       preset by the call to opendevice
        io_Unit         preset by the call to opendevice
        io_Command      GPD_ASKCTYPE
        io_Flags        IOB_QUICK set if quick I/O is possible
        io_Length       at least 1
        io_Data         the address of the byte variable for the
                        result