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    A side effect of this function is that the clock chip's interrupt level
    (IRQ8) is enabled.
 
    Only one alarm may be active at any given time. The alarm occurs every
    24 hours at the specified time until it is reset with Int 1AH Function
    07H.
 
    The program using this function must place the address of its interrupt
    handler for the alarm in the vector for Int 4AH.
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