Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 1Ah Function 06h
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  Interrupt:   1Ah     Function:   06h
 
  Title:       Set Alarm
 
  Description:                                               [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
     DH = Seconds in BCD                          If function unsuccessful
                                                  (alarm already set or
                                                  clock stopped)
                                                    Carry flag: set
                                    -♦-