The samples in this directory are not yet adapted to support ehci. So you have to start dosusb with the /1 command line option to use these samples. To support ehci, the buffer_length and actual_length parameters of the URB have to be changed. For transfers to control endpoint zero the actual_length has to be 64 and for other endpoints 512. Also buffer_length and the internal buffers of the applications have to be changed accordingly. 10th January 2010 Georg Potthast