1 completely solve the traditional 2560 board in the above win7 and win8 system is not compatible with the unstable situation.

2 the reserve of the main control chip ATMEGA2560-16AU unchanged, replacing the USB chip 16u2, Arduino project team launched using the ATMEGA8U2, ATMEGA16U2version of the product is to have their own ideas, in the vast majority of applications,the USB interface chip is used as serial "brush" and communication. And using the USB chip to professional, not only to reduce costs, but also can enhance the practicability.