Hermes-Lite I2C Extender, all pins on the backside Is bridging N2ADR LPF board and allows for experiments. Jumper can be cut off from experimental area so it stands alone. the header extension on top allows a ribbon cable to connect other backplane extension boards such as the I2C Extender board. Since I mapped all the extension connections, I added optional headers for other experiments and put the names on the pins, I hate searching pins when playing