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Installing Board Definitions in the Arduino IDE - learn.sparkfun.com
Arduino - Cores
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Whadda - DIY Projects for Makers!
MEGA2560 Mega 2560 R3 REV3 ATmega2560-16AU AVR Board on USB Cable Compatible for Arduino Mega 2560 R3 Development Board buy on ZoodMall. MEGA2560 Mega 2560 R3 REV3 ATmega2560-16AU AVR Board on USB