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Qualitative comparisons are often made between a digital differential analyzer (DDA) and a general purpose (GP) computer for real-time control applications. Such comparisons consider static and dynamic accuracy, flexibility, equipment complexity, solution stability, influence of random errors, and ability to cope with discontinuities. They do not clearly point to a machine for solution of a problem since the DDA is found preferable in some characteristics while the GP excels in others. This ground is not to be covered.