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The topics studied in discrete-time signal processing and control are particularly abstract and some aid to learning these concepts is needed. One possible type of aid is discussed which employs state-of-the-art hardware to implement a programmable digital filter which may be useful in discussing sampling, digital filtering or may be inserted as a discrete-time compensator into a continuous-time control loop. The device employs modern microprocessor hardware including ROM, RAM, interval timer, digital-to-analog, and analog-to-digital converters. Digital filters up to fourth order may be programmed as may the sampling interval to be employed. Several applications to the control of a typical continuous-time plant are given.