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     This interrupt provides an alternative means for a program to gain
     periodic control through an interrupt handler. It is suitable only
     for tasks of short duration, because when it executes the timer
     interrupt has not been completely serviced. If a handler must hold
     control for a long period──to invoke a TSR, for example──it should
     chain to Int 08h instead and allow BIOS to completely process the
     interrupt first.
 
     Int 1Ch should be called directly only from an Int 08h handler
     that does not pass control to the original BIOS Int 08h service
     routine.
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