Issue No. 03 - July-September (1983 vol. 5)
<p>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.</p>
T. H. Flowers, "The Design of Colossus (foreword by Howard Campaigne)," in IEEE Annals of the History of Computing, vol. 5, no. , pp. 239-252, 1983.