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One of the inspirations for ENIAC was the mechanical analog Bush Differential Analyzer. It influenced both the architecture and programming method chosen. However, although ENIAC could have been programmed as a DDA, there is no evidence that it ever actually was. The theory of DDAs was not developed until 1949, one year after ENIAC had been reconfigured as a stored program computer.

The first DDA built was the Magnetic Drum Digital Differential Analyzer of 1950.

Block diagram of a basic DDA Integrator. Δx causes y to be added to or subtracted from S, Δy causes y to be incremented or decremented, and ΔS is caused by an overflow or underflow of the S acumulator.