I am going to install a Pinnacle PCI Firewire card. I'm going to have to share an irq for this device...just wondering which is the least likely to cause me problems. My V5 is on 9 so that's out. Com 1 and 2 are on irq 3 and 4 respectively but I don't have a modem so I think 4 isn't being utilized. Do I dare just install it and let Windows make the call? Any suggestions, comments, tales of woe related to firewire interface installations are all welcome