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A laboratory model of a three-area tieline power flow system is described in this paper. A DEC 11/03 minicomputer and three Motorola M6800 microprocessors are used to acquire data and control tieline power flow. Algorithms are presented that implement data acquisition and permit various control strategies. Student interest in the Power Systems - Machinery Laboratory is greatly enhanced with this model and its related computer-controlled design projects, and this interest continues with further model development of economic dispatch, stability and fault analysis and other area control problems.