Duex I2C Pin 10 OR Resistor
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Cannot seem to figure out what this OR resistor is. From what I can see on the sparkfun breakout board schematic and the documentation on the SX1509B it feels like this should be a solder bridge. Obviously this is not a solder bridge.
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The purpose of that was to allow us to change the address of the DueX for trying out variants of the board.