I bought a PCI-ADC from BlueChip with their NT DLL package. Unfortunately, they only give information for C and VB programs. I've tried to replicate the C codings using Call Library functions in Labview but it keeps crashing sometimes giving me "insane"-type errors. Does anyone have any simple Labview 5.1 code allowing addressing of the NT driver bcdll.dll using Labview. I really need to see how it is done and where my mistake is. I thought I was on the way to getting it working, now nothing works. Please help! I really only need to write to the DAC.