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The Design of Colossus (foreword by Howard Campaigne)
July-September 1983 (vol. 5 no. 3)
pp. 239-252

This article describes the construction and operation of the Colossus machines. The machines had most if not all of the essential features of a modern computer, except that variable programming was provided not by memory store but by hard-wired function units selected and interconnected by switches operated by the mathematician-programmers.

Citation:
Thomas H. Flowers, "The Design of Colossus (foreword by Howard Campaigne)," IEEE Annals of the History of Computing, vol. 5, no. 3, pp. 239-252, July-Sept. 1983, doi:10.1109/MAHC.1983.10079
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