I wrote a DLL in VC++ that accesses an ADC chip through the parallel port and displays a waveform on a VB picturebox. In that DLL, I disable the system interrupts during the waveform sampling period to prevent jitter from mouse movements and whatever else is raising an interrupt at that moment. Anyway, when the interrupts are disabled, the Windows tray clock loses time because it's not getting timer interrupts from the PIT. I can read the CMOS RTC from port 70H and 71H but I tried resetting the clock with the API functions SetSystemTime and SetLocalTime, this however does not update the tray clock. I can't figure it out. Anyone know the secret? Thanks.

John Voltz