Programmable shift registers for numerical multiplication

A programmable shift register using `modulo 2¿ or (non-carrying) binary arithmetic is briefly described. The additional problems of making a programmable shift register for numerical binary arithmetic are examined in some detail. An experimental programmable shift register made from standard integrated circuits is described together with performance tests. Various uses of the device are suggested. Its use as a coefficient multiplier in a computer using serial digital techniques where analogue techniques were previously used is examined.