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Working models interfaced to micro-computers provide an inexpensive way of simulating realworld situations. Students working with these systems gain a feel for the scope of microcomputer applications in addition to learning micro-processor fundamentals. A micro-computer controlled slot car system has been built for use in the laboratory section of a micro-computer course. This system allows the students to experiment with a realistic micro-computer application. A stimulating environment, where learning is enjoyable, has been created.