Beta variant code for this board using new STM32duino "CUBE" code base: https://github.com/stm32duino/Arduino_Core_STM32F4
"Black" folder - Arduino pin numbers follow Port sequence: PA0..PE15
"Black V2" folder - Older version with pin numbers following the board layout: PE2, PE3...
The board is described at http://wiki.stm32duino.com/index.php?title=STM32F407.