INT 1A - TIME - SET ALARM (ATIBM PC AT,XT286IBM PC XT/286,PSIBM PS/2, any model)
	AH = 06h
	CH = hour (BCD(Binary Coded Decimal) A method of data storage where two decimal digits are stored in each byte, one in the upper four bits and the other in the lower four bits.  Since only the values 0 through 9 are used in each half of a byte, BCD values can be read as decimal numbers on a hexadecimal display of memory or a file.)
	CL = minutes (BCD(Binary Coded Decimal) A method of data storage where two decimal digits are stored in each byte, one in the upper four bits and the other in the lower four bits.  Since only the values 0 through 9 are used in each half of a byte, BCD values can be read as decimal numbers on a hexadecimal display of memory or a file.)
	DH = seconds (BCD(Binary Coded Decimal) A method of data storage where two decimal digits are stored in each byte, one in the upper four bits and the other in the lower four bits.  Since only the values 0 through 9 are used in each half of a byte, BCD values can be read as decimal numbers on a hexadecimal display of memory or a file.)
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(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. does not check for invalid values for the time, so the CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption.
	  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"