AH = 03h: Set RTC Time

This function sets the time in the real-time clock. Also, this function sets bit 7 of the BIOS RAM variable [SysFlags].

• Input: AH = 03h
  CH = Hours in BCD
  CL = Minutes in BCD
  DH = Seconds in BCD
  DL = 01h if Daylight Saving time
  00h if Standard time

• Notes: The HP palmtop does not use or modify the Day Light Savings flag. It is returned for compatibility only.
• Output: AH = 00h
  Carry Clear

• Error conditions: Carry Set if RTC inputs invalid
• Registers modified: AX, STATUS