Arduino third party hardware

• Arduino Environment

Support for third-party hardware can be added to the hardware directory of your sketchbook directory. 
Platforms installed there may include board definitions (which appear in the board menu), core libraries, 
bootloaders, and programmer definitions. 
To install, create the hardware directory, then unzip the third-party platform into its own sub-directory. 
(Don't use "arduino" as the sub-directory name or you'll override the built-in Arduino platform.) 
To uninstall, simply delete its directory.

• Arduino 1.6.x IDE ADAFRUIT

Unzip the file and navigate inside the Adafruit_Arduino_Boards folder to find a hardware subfolder with a small hiearchy of files, 
and a drivers folder with Flora drivers specific to Windows.

Next find your installed Arduino IDE's hardware subfolder.  
For Windows and Linux the hardware subfolder should be directly beneath the folder where Arduino's IDE was installed.

Automatic installation

• Boards Manager Support File Locations on GitHub

• Add new board without Board Manager on IDE 1.6.8

Boards Manager installs hardware packages to C:\Users\(username)\AppData\Local\Arduino15\packages by default.

If you create a folder named portable inside the Arduino IDE installation folder and restart the IDE 
then Boards Manager will install hardware packages to {Arduino IDE installation folder}\portable\packages instead.

8051

• Arduino 8051 in FPGA