INT 14h,  14h    Enable or disable watchdog processing

      Entry:  AL         01h - Enable watchdog
                         00h - Disable watchdog

              DX         Port number

      Exit:   None

    When watchdog is enabled,   the state of the carrier detect (CD) line on
    the comm port specified in DX should be constantly monitored. Should the
    state of that line become FALSE (carrier lost), the system should be re-
    booted, to enable the BBS (or other application) to start up again. This
    monitor is not affected by Init/Uninit etc.