>While we're on the topic what are valid alternatives? Particularly ones >suited to impelementing the mass storage USB device class. Well, there are several I've seen in my travels... A list of places to try: http://www.atmel.com http://www.ti.com http://www.philips.com http://www.cypress.com http://www.motorola.com http://tinyurl.com/t45k (links a google search) FDTI is *not* useful for mass storage. They only have com port devices, and unless you want to write the host side driver, they will only act as com port emulation devices. Note: All of the URL's I've listed turned up *some* kind of USB micro, but whether they support high speed (USB2.0 only) or not, I don't know (wasn't looking for that at the time). --Brendan P.S.: Some time I might put together a chart of the various options, but not today. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.