This option selects wheather two 2x8 pin female 2mm connectors (HDR2X8F200F) are soldered onto the Frontend connector of the board - see Socketed section below. This will enable any Frontend board to be plugged into this board. Following are the different methods for connecting Frontend and Main (SBC) boards.


 Frontend Boards
Frontend boards can be connected to Main (SBC) boards to add additional functionality. They have 2mm pin headers soldered horizontally onto them. They connect with the card edge connector on the Main board. There are a couple of ways to connect the Frontend board to the Main board:
-- Solderless --
Seeing that the Main board is 1.6mm thick, and the distance between the rows of the 2mm connector is 1.5mm, the connector fits tightly when mated. This connection method should only be used for prototyping, and is NOT a permanent connection!
-- Soldered --
To connect the two boards together permanently, the pins can be soldered onto the card edge connector of the Main board (In the same way as they are soldered onto the Frontend board).
-- Socketed --
A socket can be soldered onto the card edge connector of the Main Board, into which the pins of the Frontend board fits.
Click on image to enlarge!

All new Frontend Boards have areas cut out on the board for the connector to fit into. By doing this there is no gap between the Main and Frontend board when mated! The image shows a Main (top green board) and Frontend (bottom beige board) plugged together.
Click on image to enlarge!