Magnetic thin film memory having low access currents

Thin film memories are stated to be the best as far as high speed performance is concerned when compared with other techniques. Access time is only limited by the associated electronic circuits. The cost of a memory circuit may be considered as the cost of the storing medium itself and the cost of the associated electronics. The thin film planes are the least expensive since they are capable of simple and automated production. The authors describe a development programme of three successive planar magnetic thin film memories. One employed planes evaporated on to glass substrates, the other two using metal substrates. Technical details are given of two electrically identical memories constituted on different mechanical frames. Access to elementary memory cells is by means of two printed circuit conductor networks mutually arranged at right angles. Output characteristics are given as well as the descriptions of two models, one for 256 words of 36 digits and one for 1024 words of 36 digits. The models were tested by the use of a special memory exerciser for a systemmatic sequential control of the operation.