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  Description:  Set Watchdog Time-Out      [PS/2]
 
  Enables or disables a watchdog timer.
 
  Input                                            Output
  ═════════════════════════════════════            ════════════════════════
  AH=C3H                                           If function successful
  AL=subfunction                                   Carry flag=clear
     00H to disable watchdog time-out              If function unsuccessful
     01H to enable watchdog time-out               Carry flag=set
  BX=watchdog timer counter (if AL=01H)
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