RESEARCH ON LOW-POWER MAGNETIC-FILM MEMORIES.

The objective is to demonstrate the feasibility of fabricating microminiaturized evaporated circuitry for use with the low-power magnetic-film memory elements. The layout of a 64-word, 24bit-per-word memory system, complete with address registers and timing circuits, was completed. This layout is used to ensure the compatibility of individual circuit designs with the system. A word driver, two bit drivers, and a sense amplifier have been designed and breadboard models have been constructed and tested. Word drivers have been evaporated and a driver has been used to operate bits on a 4-by-4 memory array. Bit drivers have been evaporated but not tested. The physical layout of the sense amplifier is being designed. Techniques for the preparation of evaporated resistors have been improved to the extent that resistance tolerance is now 15 percent. Large memory arrays of 64 words, 24 bits per word have also been successfully evaporated. Disturb tests have been performed on individual bits. The disturb-current margin on good films is about 100 percent, even after 10 to the 4th disturb pulses are applied. Author