Abstract :
The paper discusses in some detail that part of a digital computer, Decca Cl, which has been built with `square¿ hysteresis-loop ferrite cores. This part of the computer comprises the arithmetic and controlling circuits and the storage registers. The development of three basic logical circuits is indicated, and there is some discussion of the behaviour of these circuits. Designs of the basic circuits are given, and, using these, the logical designs of parts of the computer are indicated. One section of the paper is a brief description of those parts of the computer in which magnetic circuits combine with familiar electronic circuits. In conclusion, two possible lines of fruitful development are indicated which would increase the efficiency of computers. One particular barrier at present is the absence of any satisfactory cheap low-resistance rectifier.
