Int 1A Fn 0C  - Time - Set Rtc Date/time Activated Power-on Mode (ibm)     [B]

   AH = 0Ch
   CH = hours (BCD)
   CL = minutes (BCD)
   DH = seconds (BCD)
   DL = day of month (BCD)

Return: CF clear if successful
   CF set on error (alarm already set or clock nonfunctional)
Desc:  set an automatic power-on for a given time in the future

Note:  IBM classifies this function as optional

See Also: AH=06h,AH=0Dh,AH=0Eh,INT 4A