AH = 0Ch: Set Future Alarm

This function extends the functionality provided by Fcn 06h to allow an alarm to be set at any date in the future. This function, like function 06h will generate an Int 4Ah at the specified time. The user must place a pointer to an appropriate interrupt handling routine in the Int 4Ah vector. The alarm will reoccur every 24 hours if not reset using Fcn AH = 07h.

• Input: AH = 0Ch
  AL = Year in BCD
  BH = Month in BCD
  BL = Day in BCD
  CH = Hours in BCD
  CL = Minutes in BCD
  DH = Seconds in BCD
  DL = Century in BCD

• Output: AH = 00h
• Error conditions: Carry Set iff alarm already set or RTC defunct
• Registers modified: AX, STATUS