bogdanm
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Though you might like to know, there are some projects out there that implement the USB protocol only in software, without the aid with some additional interfacing chip. Sorry if this was already posted. Check out the links below:
http://www.sxlist.com/techref/ubicom/lib/io/dev/keys/usbdemo-mh.htm
http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
http://www.sxlist.com/techref/ubicom/lib/io/dev/keys/usbdemo-mh.htm
http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm