GB977737A - Improvements in digital data storage systems - Google Patents

Abstract

977, 737. Permanent stores. IBM WORLD TRADE LABORATORIES (GREAT BRITAIN) Ltd. April 18, 1963 [April 24,1962], No. 15595/62. Heading G4A. [Also in Divisions H1 and H3] Each magnetic storage core 10 of a permanent store has its drive winding 15 connected to the secondary winding 19 of a respective transformer, the coincident selection conductors X, Y of the store forming transformer primary windings. A core is switched only when both primary windings of the associated transformer are energized simultaneously. Only certain cores in each row are switchable, a single X conductor being provided which extends through the store and threads selected transformers in each row, and a separate Y conductor being provided for each row which threads all the transformers in the row. The basic assembly comprises insulating base members 20, Figs. 3 and 4, carried by semicircular end members 21, the base members supporting U-shaped core portions 13 of the transformers. The X and Y conductors are fitted to the basic assembly, the conductors being laid so as to pass through the aperture of a transformer core or to by-pass the aperture as required by the wiring pattern. When wiring is completed, insulating strip members 16 are fitted over the U-shaped core portions, the strips being printed on one surface with an earthing circuit 17, Fig. 6, and having printed secondary windings 19, Fig. 5, on the opposite surface. Subsequently the transformer cores are completed by fitting I-shaped portions 11 which are attached to portions 13 by clips 8. The toroidal storage wires 10 are supported by polystyrene frames 14 which are mounted on the strip members 16, the drive windings 15 threading the cores being connected to the respective printed secondary windings by terminal tags. The columns of cores are threaded by sense windings 12 which as shown in Fig. 4 alternate in direction through the cores. Ferrite rods or magnetic thin films may be used in place of the toroids. Specifications 969,976 and 977,738 are referred to.