Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     The function call returns immediately. If the function is
     successful, bit 7 of the semaphore byte is set when the specified
     interval has elapsed. The calling program is responsible for
     clearing the semaphore before requesting this function.
 
     The actual duration of an event wait is always an integral
     multiple of 976 microseconds. The CMOS date/clock chip interrupts
     are used to implement this function.
 
     Use of this function allows programmed, hardware-independent
     delays at a finer resolution than can be obtained through use of
     the MS-DOS Get Time function (Int 21h Function 2Ch) which returns
     time in hundredths of a second.
 
     This function is not supported on the PS/2 Models 25 and 30.
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