| 摘要 |
766,189. Electric digital-data-storage apparatus. INTERNATIONAL BUSINESS MACHINES CORPORATION. Aug. 20, 1954 [Aug. 25, 1953], No. 24275/54. Class 106 (1). [Also in Group XXXIX] In a storage matrix of magnetic elements, each of which reverses its state on application of an energization of between 1 and 2 units, 2 units of energization are applied to all the elements of a selected word line and 1 unit of energization is applied additively or subtractively to all of the elements corresponding to a given word bit so as to switch or not the corresponding word-bit element of the selected word line as desired. Thus, a 3: 1 ratio of energization and a high speed of operation are obtained. In a threedimensional matrix, a word line, e.g. 20, 24, is selected for writing by passing current through an appropriate X tube 34 and an appropriate Y writing tube 35 sufficient to apply 2 units of energization to the cores by means of coils 30, 36. Further coils 32, 38 are connected in respective Z plane word-bit circuits, each of which is energized to produce either an additive or subtractive unit of energization in the elements, the word-bit elements in the selected word line being switched or not accordingly. For reading purposes, at least 2 units of energization are applied negatively to all of the cores 20, 24 of a selected word line by means of coils .31, 42, the circuit being completed through a X tube 34 and a Y reading tube 41. During this operation, output pulses are produced in further coils 43 in cases where the elements had been switched from their initial states. Diodes 37 prevent sneak paths. In order further to increase the speed of operation, a transistor 56, Fig. 4, may be associated with each element, an additional coil 52 being connected to the base of the transistor and the word-bit coil 53 being connected to the collector 55. On receipt of negative pulses on coils 51 and 53, the potential of the base is lowered and the collector passes more current, still further lowering the potential of the base through the coils 53, 52, and so producing a re-generative action. |
