A transistor digital differential analyser
Peter Owen, M.F. Partridge, T. R. H. Sizer · Journal of the British Institution of Radio Engineers · 1961
The digital differential analyser described employs transistors throughout and has a magnetic core store. It has operated for about 2000 hours under laboratory conditions. The principles of the d.d.a. are discussed briefly, then its logical design is described in some detail. Complete circuit details are not given but three of the more interesting elements are described in an appendix.