We are not sure about existing Arduino boards, but the last six bytes of EEPROM have a unique serial number. At this point, the Mega 2560 has some kind of issue with gcc on certain platforms and ...

Arduino 1.6.4 library for control: Initialize board, move Heap to expansion ram, assign pages to panes, save and restore pagemap. – Pin Used Selectable: P53. Pin 53 is use as SPI_SS by default.

When you think of Arduino ... a wide range of boards for your projects, all with different add-on features and coming in different sizes. There's the 53x101 mm Mega 2560 with 54 digital I/O ...