Hi Paul Each installation can vary due to the computer and the fact that that is a legacy card. Usually those cards were not Plug and Pray (not a typo for the early days). You should have jumpers on the card for I/O (DMA and/or IRQ). In your computer's BIOS you may need to set the slot that your card is in to a "legacy" setting where you can force the slot to use a specific IRQ and DMA channel. Win XP can't assign this card to the proper values because it can't see it. Setting the slot to the card's values will allow WinXP to allocate the ressources to the card and move other ressources to the P&P devices you have. Try to use IRQ settings above 7 (9, 10,11 are usually OK) on the ISA card. Check the Device Manager in WinXP to see what's available. Gilles -------- Message d'origine-------- De: Stable Isotope Geochemistry de la part de Paul Eby Date: mer. 2005-12-28 23:41 À: [log in to unmask] Cc: Objet: [ISOGEOCHEM] Isodat NT and WinXP Isodat users, According to several posts over the years, it is possible to run Isodat NT on WinXP, with the older ISA cards. I haven't had much luck getting this to work though: can someone who has done this give some detailed instructions on getting the ISA card to communicate under XP? Paul Eby [log in to unmask] Biogeochemistry Lab (E-Hut, room 102) School of Earth and Ocean Science University of Victoria PO Box 3055 Victoria, B.C. Canada V8W 3P6 phone: 250-721-6183 fax: 250-472-4620