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1A06

Category: BIOS

INT 1A - TIME - SET ALARM (AT,XT286,PS)

	AH = 06h
	CH = hour (BCD)
	CL = minutes (BCD)
	DH = seconds (BCD)
Return: CF set on error (alarm already set or clock stopped for update)
	CF clear if successful
Notes:	the alarm occurs every 24 hours until turned off, invoking INT 4A each
	  time
	the BIOS does not check for invalid values for the time, so the CMOS
	  clock chip's "don't care" setting (any values between C0h and FFh)
	  may be used for any or all three parts.  For example, to create an
	  alarm once a minute, every minute, call with CH=FFh, CL=FFh, and
	  DH=00h.
SeeAlso: AH=07h,AH=0Ch,INT 4A"SYSTEM"

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  Copyright 2000   by Ralf Brown     Updated Jul 2000