why not just buy a hardware based pci modem? The 3comm performance pro runs great in linux and is hardware based, plus being pci will be usable in all modern motherboards. In addition, you're assured of having access to the latest drivers for your moddem. c'mon, how many comanies today are putting out top of the line drivers for their isa modems??? i know, you're arguments used to make sense about 18 months ago, but no longer. An ISA modem is certainly a useful product, but not something you buy today when faced with the alternative of pci hardware based modems. ISA is dead......Go with ISA if you're running Linux, and ISA willl give you better performnce cuz its hardware, not software based