| 摘要 |
1,138,297. Magnetic storage apparatus. HOLLANDSE SIGNAALAPPARATEN N.V. 31 March, 1966 [6 April, 1965], No. 14376/66. Heading H3B. A reading and writing circuit for a two-coreper-bit store comprises two parallel column wires 12, 17 which are energized from a common pulse transformer 1 and are connected in series with respective resistors 6, 7, the voltage developed across the resistors being applied to an amplifier 11 the input of which is connected to a reference potential 10 by resistors 8, 9. For writing into a core 13 or 15, a row word wire 14 or 16 is pulsed at the same time as a pulse from a source 3 is passed through the column wires 12, 17 by closing a switch 4 or 5 in the primary circuit of the pulse transformer. The switch operated determines the pulse polarity and therefore which of the two cores associated with an energized row wire is switched. For reading, the row wire is energized by a pulse of opposite polarity and in this case a read-out voltage is obtained across the resistors 6 and 7 to which the amplifier responds. The provision of resistors 8, 9 and the reference potential 10 prevents spurious voltages produced during the writing operation from influencing the amplifier. |
