They are labeled on the board - I don’t know if there’s only been one version of the board, but on mine F1 is marked DIGITAL (which is used) and F2 is marked ANALOG (which isn’t used.)
They are labeled on the board - I don’t know if there’s only been one version of the board, but on mine F1 is marked DIGITAL (which is used) and F2 is marked ANALOG (which isn’t used.)