schematic for common proto board

This is a common board on ebay. I bought 2 of them, but no schematic. Does ANYONE know what the schematic and or board layout is? The labels are confusing, and don't seem to match on the top and bottom.

Thanks. Yes I have been using an ohm meter to try to figure it out. some pins are identfied on the bottom, but not the top and there seems to be a mismatch between the top and the bottom.

If you search "keyes 5.1" you can find this