I'm using LabView 7 to control a few PCI-DIO-96 cards. I've been told that the DIO Port Config.vi always affects (i.e., set all lines to zero) "mate ports". I'm using the term mate ports to refer to the three ports in a 8255 PPI chip. Ex: Assume that I have three channel names for the first three ports on a PCI-DIO-96 card,if I call DIO Port Config.vi for the first port, the second and third port lines get set to zero (regardless of the configured direction, through MAX). Assuming that these ports were configure as outputs, and that I had written some data to them, this would be a real problem for me.