This review details the old RCX analog port function and the new NXT digital sensor architecture. The essentials of I2C communications are explained, as well as basic NBC programming using I2C.
This review is NOT intended for hardware experts or professional hobbyists looking for the nitty-gritty internal details but rather to the common users, who wants to know some principles of the new NXT analog and digital architecture.

Part II of this review will be published soon, and will detail RobotC I2C support and example third party I2C products which can expand your NXT capabilities.