GB768389A - Magnetic information registering devices - Google Patents

Abstract

768,389. Electric digital-data-storage apparatus. BURROUGHS CORPORATION. Dec. 3, 1954 [Dec. 7, 1953; March 31, 1954], No. 35078/54. Class 106 (1). [Also in Group XXXIX] In a magnetic core stepping register, the coupling circuits connecting adjacent cores each include means for normally preventing the transfer of information; these means being selectively disabled when a transfer is to take place. The output winding 14, Fig. 1, of a core 108 is connected to the input winding 11 of the next core 109 by rectifiers 22, 25 which normally prevent current flow between the windings. However, centre taps on the latter are connected in series with the shift winding 18 to which advancing pulses are applied. Thus, an advancing pulse from a source 150 biases the rectifiers in opposite senses so that an output pulse induced in the winding 14 is transmitted to the winding 11. At the same time, the information bit registered in a core 110 is passed to a core 111, the corresponding windings being connected in the same circuit. A delayed pulse from a source 151 acting through a similar circuit completes the step shift. The circuits shown may be duplicated to enable information to be step-shifted in either direction. The biasing current which enables a transfer to be effected between two cores may be independent of the advancing pulses as shown in Fig. 6, in which a biasing current I renders effective a coupling circuit between cores 135, 136, transfer being effected by a pulse from a source 149. The current I is equally divided between the two branches of the coupling circuit and so is itself ineffective to alter the states of the cores. Transfer from the core 136 may be effected by a pulse from a source 170, selectively to a core 137 or to a core 237 by appropriately applying biasing currents Ia or Ib.. In a further embodiment, Fig. 7, the advancing pulses are applied to the coupling circuit asymmetrically as shown, so that the coil 141<SP>1</SP>, e.g. serves both as the shift winding and as the output winding. Separate resistors 298, 299 may be used in this case to balance the circuit. However, to increase the speed of operation, the input windings 142, 143 of the core 136 may be unbalanced in such a sense as to tend to re-set the core 136.