1 10k Ohm Resistor Reset pull-up XXX Motor Driver Boards Left and Right Boards. Separate boards for left and right sides are used because of space constraints. The board is formatted to fit down by the motors in the cavities left by the motor's shape, and the shape of the area where the motors are placed. They are roughly mirror images of each other. Component placements are mirrored, but the circuit trace layout is individual for each.
Differences are due to component pin outs.
LED Indicator Boards Generic LED indicator board. Can be jumpered to light the LED on high or low input signals. At the moment I see use for two of these boards for indicators of Motor status. One mounting hole on roughly the mid line of the board at each end. Strapping is done from the center row to one or the other outer side.