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