X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 1a - clock

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INT 1A - CLOCK - GET TIME OF DAY
        AH = 00h
Return: CX:DX = clock count
        AL = 00h if clock was read or written (via AH=0,1) since the previous
                 midnight
             Otherwise, AL > 0
Note:   IBM and many clone BIOSes set the flag for AL rather than incrementing
          it, leading to loss of a day if two consecutive midnights pass
          without a request for the time (e.g. if the system is on but idle)
SeeAlso: AH=02h,INT 21/AH=2Ch

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