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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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VTD_Begin_Min_Int_Period  Sets interrupt frequency
VTD_Disable_Trapping      Disables I/O trapping on timer ports
VTD_Enable_Trapping       Enables I/O trapping on timer ports
VTD_End_Min_Int_Period    Restores interrupt frequency
VTD_Get_Interrupt_Period  Returns timer interrupt frequency
VTD_Get_Real_Time         Returns elapsed time since start of Windows
VTD_Get_Version           Returns version number
VTD_Update_System_Clock   Updates system clock