I am looking at my system in both system information, and in the computer\nproperties.\n\nI cannot see the following IRQ's: 3, 5, 7, 11, and 17. I am very\ncurious to know why Windows did not assign them, and doubled up others to be\nshared?\n\nThe second thing is that I cannot seem to figure out what USB device is on\nwhat USB Universal Host Controller. Each controller has a set of ports in\nassociation with it. I found the Host Controller addresses.\n\nWhat I want to do in the end, is to determine exactly which USB device is in\nwhich port when viewing it in the System Hardware Properties.\n\nIt turns out that one of the USB Host Controllers is being shared in IRQ\nwith the ATA hard drive. Another Host Controller is being shared with a\nmodem. There is another one that is being shared with the video display.\n\nI have an HP 4670 Scanner, and it is giving loss of communications problems\nbecause of the IRQ sharing. I found this out after doing a lot of searching.\nTo get around that, I used the USB Host Controller that in shared with the\nleast demand. This was the one that is shared with the modem. The scanner\nwas now, only failing to communicate once in a while.\n\nTo resolve the issue, I added an active USB hub to act as a type of buffer.\nIt actually is slowing down the USB communications. With this approach, the\nscanner seems to be working for now. I tried it many times over the coarse\nof the evening, and it has not failed yet.\n\nWhat I am looking for, is if someone would have an explanation for this???