The ATmega328 is the standard chip that comes with the Duemilanove, etc.
The ATmega1280 is the chip that comes on the Arduino Mega, and provides somewhere around 54 Digital I/O pins, rather than the normal 14 from the '328.
The ATmega328 is the standard chip that comes with the Duemilanove, etc.
The ATmega1280 is the chip that comes on the Arduino Mega, and provides somewhere around 54 Digital I/O pins, rather than the normal 14 from the '328.