RCM User Guide: documentation of the pinout of the RCM board.
Robot Control Module: instructions and CAD for the original 3 versions of RCM boards.
power with 5 NiMH AA batteries
See https://github.com/RCMgames/RCM-Hardware-BYTE and https://github.com/RCMgames/RCM-Hardware-Nibble for more advanced Robot Control Modules.