There is a KB reference to use DK51 as a low cost alternative for cypress ez-usb. http://www.keil.com/support/docs/2356.htm Now, will this work for FX2? I did't find it under products at all, is it discontinued? What low cost option do I have for <16k firmware for fx2? I have my firmware working with evaluation version, but now that I developing my windows app, I can't load it with cyusb.dll. Any help? Regards Gabriel Camiro