We have quite specific hardware in use makes zicken to USB adapter cables sometimes. Also there are some PCI or PCIe cards do not use the real slot but internal USB. This also made problems in our application. This map (and the PCI counterpart) funzt but very reliable, drivers also perfectly. At least under WinXP and Win7. Linux and Mac I have not tested, but drivers are also available for this. On the Internet even more recently than on the CD.