X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - system

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INT 15 - SYSTEM - EVENT WAIT (AT,XT286,CONV,PS)
        AH = 83h
        AL = subservice
            00h = set interval
            01h = cancel
        ES:BX -> event flag (bit 7 set when interval expires)
        CX:DX = number of microseconds to wait (only accurate to 977 us)
Return: CF set if function already busy
Note:   the resolution of the wait period is 977 microseconds on most systems
          because most BIOSes use the 1/1024 second fast interrupt from the AT
          real-time clock chip which is available on INT 70
SeeAlso: AH=86h, INT 70

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