Large, high speed two dimensional core memory

摘要

A large, high speed core memory includes in excess of one million highly stable, closedly spaced cores arranged in a single homogeneous continuously wired two dimensional, two wire array without need for temperature compensation, temperature gradient heat uniformization, forced conduction, uniform placement on a storage plate or heat sinking plate, liquid cooling or air conditioning. Highly temperature stable, low coercivity cores operate with low drive current in combination with precise temporal control of large magnitude, short duration drive currents causing extremely fast, abbreviated flux switching to attain optimum stability of core switching characteristics with respect to variations in temperature, drive current and core physical characteristics while minimizing power dissipation to facilitate the use of integrated circuits. The factors of using a large two dimensional array, large drive currents, driving the cores in a major hysteresis loop, short duration partial flux switching, and temperature independent cores all react with and enable one another to permit the fabrication of a large, economical, very fast core memory. In a multistate mode of operation the partial select digit write current has a duration selected from a plurality of discrete durations in accordance with information being stored. During a subsequent readout, the stored information is indicated by the number of discrete time intervals during which the voltage magnitude of output switching signal remains above a predetermined threshold.