iduino Mega 2560 R3 Board Atmega2560-16au Atmega16u2 Arduino Compatible Mega2560 - Orange The MEGA 2560 Board for Arduino comes preburned with a bootloader that allows you to upload new code without the use of an external hardware programmer. Fully compatible with Arduino Mega 2560 R3/UNO development board and IDE software. Can be powered via the USB connection or with an external power supply. the power source is selected automatically. Communicates using the original STK500 protocol Have 256 KB of flash memory for storing code (of which 8 KB is used for the bootloader), 8 KB of SRAM and 4 KB of EEPROM (which can be read and written with the EEPROM library).