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  Description:  Set Alarm      [AT] [PS/2]
 
  Sets an alarm in the CMOS date/time chip.
 
  Input                                             Output
  ══════════════════════════════════════            ════════════════════════
  AH=06H                                            If function successful
  CH=hours in binary coded decimal (BCD)            Carry flag=clear
  CL=minutes in BCD                                 If function unsuccessful
  DH=seconds in BCD                                  (alarm already set,
                                                      or clock stopped)
                                                    Carry flag=set
                                    -♦-