An eval (evaluation) board, or development board, is a printed circuit board which contains the support logic needed for a programmer to become acquainted with a microcontroller and learn how to program it. An eval (evaluation) board, or development board, is a printed circuit board which contains the support logic needed for a programmer to become acquainted with a microcontroller and learn how to program it. An eval (evaluation) board, or development board, is a printed circuit board which contains the support logic needed for a programmer to become acquainted with a microcontroller and learn how to program it.