Installing additional cores

Starting from the Arduino Software (IDE) version 1.6.2, all Arduino AVR boards are installed by default. Some Arduino boards require an additional core to be installed, therefore we have implemented the Boards Manager as the preferred tool to add cores to your Arduino Software (IDE). Cores are necessary to make new microcontrollers compatible with your Arduino Software (IDE) and, possibly, the existing sketches and libraries. We develop the cores for the new microcontrollers used in our new generation boards, but anyone may develop a core for their own boards following the rules and requirements we have issued. How to install an Arduino...