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0040h:006Ch           Long integer with Timer Counter

    Length: 4 bytes

    Holds the number of ticks needed to reflect the current time in a
    4-byte integer. Every timer tick (18.2 per second) activates Int
    08h, which increases this value by 1. After this value reaches
    midnight (1800B0h), it is set to 0 and the byte at 0040h:0070h is
    set to 1.

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    Use Int 1Ah, Service 00h, to obtain this value. Note that doing so
    clears the overflow flag at 0040h:0070h.