A core-transistor logical element

The paper describes a square-loop magnetic-core/junction-transistor circuit-element which is suitable for operation in complex logical systems at medium digit rates. Temporary storage between logical operations is obtained by virtue of the remanent property of the core. Use is made of the constant-current pulse from each stage and the field threshold of the material to provide a number of the elementary logical operations by the method of analogue summation of field inputs. Regenerative connection of each stage enables the power requirements of the master pulse trains to be considerably reduced. For flexible operation the input to each stage is strobed, so that the input/output characteristic is improved and output-pulse-length variation is overcome. Some examples of the applications of the element are given, and the limitation on its use is explained. A modified form of the basic circuit is described which enables shift-register circuits based on the single-core-per-bit principle to be constructed. Generalized design data are given, and the results are evaluated for components currently available.