The Arduino Team presented ... At this point, the Mega 2560 has some kind of issue with gcc on certain platforms and unable to use the full memory available until there is an update to the IDE.

“he new CANADUINO MEGA 2560 PLC 500 is based on an Arduino MEGA 2560 compatible ... and offers a Dallas DS3231N real-time-clock and a memory card slot plus several communication channels like ...