I inherited this board a while back that is AT90USB645-based. Lots of I/O ports, an 8x8 LED matrix, 4 push and 4 slide switches, 2 USB, SD card, and sound - lots of stuff. But no manual or identifying marks so I can track down more information!
It is in a blue box, and is about 2.75 x 4 inches in size. Here’s a picture…
http://i.stack.imgur.com/4HAo0.jpgAny ideas? I’m drawing a blank