A prototype system was developed to evaluate a computer-assisted performance training carrel which was used to present the troubleshooting fundamentals lesson of the Lowry Technical Training Center's Electronic Principles Course. This manual provides a description of the PDP-11 and PLATO programs used to implement this system, and an operators guide for using the system. The PLATO data input system deletes characters from the data stream whenever more than about three characters per second are transmitted. In order to overcome this problem, the PDP-11 in the carrel is used to control all of the simulation, and transmits only the small amount of data necessary for monitoring the student's performance. The nature of the tables used in the simulation and the philosophy of the communications protocol are explained. (Author)