Megabit memory

The present status of the co-incident-current matrix memory is largely one of hope for the future, in so far as very large memory systems are concerned. Memories made to use presently available materials are limited by cost and associated engineering problems. The problems arise largely from the use of ferrite cores. The major problem is the nonuniformity of the cores. Procurement, core testing, matrix wiring, matrix testing, and core replacement also present serious difficulties. Complicating these problems are the material properties of the ferrites, such as temperature and strain sensitivity, the necessity for operating on a minor hysteresis loop, and the difficulties encountered in varying the magnetic parameters to fit a core to a system.