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

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INT 15 - SYSTEM - WAIT (AT,XT2,XT286,CONV,PS)
        AH = 86h
        CX,DX = number of microseconds to wait (only accurate to 977 us)
Return: CF clear: after wait elapses
        CF set: immediately due to error
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=83h, INT 70

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