Peter, What kind of terminal(s) does it have? It sounds like it might be a A/D or perhaps a D/A card. HP made some A/Ds I think I have some docs on it somewhere. I used to have one the cards I never got around doing anything with it. I never even pulled it out of the machine so I don't know if it was made by HP or if it was made by someone else. IIRC it had a row of screw terminal on the back side of it. I looked through the manual for the HP A/D card at one time and I don't think it took any special software. The system treated it somewhat like a GPIO card but the digital value that was input was converted from the analog input. If you output a digital value to the card it selected the channel number (12 channels as I recall) and range. If you think your card may be a A/D, I'll try to find the docs that I have. I forgot to ask, is this a DIO card? Joe At 09:47 PM 5/3/03 +0000, you wrote: