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INT 14h,  07h    Return timer tick parameters

      Entry:  None

      Exit:   AL         Timer tick interrupt number

              AH         Ticks per second on interrupt number in AL

              DX         Approximate number of milliseconds per tick

    This is used to  determine the parameters of the timer tick on any given
    machine.  Three numbers are returned:

        AL =   Timer tick interrupt number
        AH =   Ticks per second on interrupt number shown in AL
        DX =   Milliseconds per tick (approximate)

    Applications can use this for critical timing  (granularity of less than
    one second) or to set up code  (such as a watchdog)  that is executed on
    every timer tick. See function 16h (add/delete function from timer tick)
    for the preferred way of actually installing such code.