Step 3Remove the BGP100 controller board
The board section with the D-pad can be removed as it is only a contact board that uses the wires to connect to the button presses. The board with the chips on it is the proper controller board.
The D-pad and left shoulder button use a common grounding, however the right shoulder button and the other buttons do not use a common ground, so you need to wire both sets of contacts per button to the SNES board, and keep their contacts unique.
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