Link from the documentation: http://www.rt-net.jp/products/rt-adk http://www.rt-net.jp/products/rt-adk The site was down before but seems to up again now (it s

Link from the documentation: http://www.rt-net.jp/products/rt-adk http://www.rt-net.jp/products/rt-adk The site was down before but seems to up again now (it seems like the page was also empty the first time I looked--guess they just made it visible). I'm not familiar with the company. From the documentation it seems like a standard Arduino (Mega?) with the USB Host shield will also be compatible--depending on memory limitations.