Patent GB-995739-A (GB)
Title: An arrangement for the operation of information stores
Inventor: KUTSCHBACH ROLF
IPC: G11C11/06
Filed: 1961-09-29
Abstract: 995,739. Circuits employing bi-stable magnetic elements. ELEKTRONISCHE RECHENMASCHINEN - WISSENSCHAFTLICHER INDUSTRIEBETRIEB - KARL - MARXSTADT VEB. Sept. 29, 1961, No. 35193/61. Heading H3B. [Also in Division G4] In an arrangement for the operation of information stores with column wires, 41 to 46, and row wires (not shown) for coincidence control, a ferrite core shift chain 1, each core, 2 to 8, of which has an input winding 29 to 35, an output winding 11 to 16, and a shift winding 9, 10, is used with reading wires 42<SP>1</SP> to 47<SP>1</SP> of the store for serial reading of information, the output winding of each ferrite core being connected to the input winding of the next core through a transistor 23 to 28 and an OR- circuit 17 to 22; the emitter-collector circuits of the transistors are serially connected with respective writing wires 41 to 46, input windings 30 to 35, limiting resistors R1 to R6 and reading wires 42<SP>1</SP> to 47<SP>1</SP>, while the respective ends of the writing and reading wires are connected through diodes 48 to 71 to respective transistor switches 37 to 40 which are controllable to connect diodes 48 to 59 to earth potential, and diodes 60 to 71 to a negative potential; one of the two inputs of each OR-circuit 17 to 22 is connected to an output winding 11 to 16 and the second inputs 76 to 81 are connected to an address register (not shown), while the output of each OR-circuit is connected to the base of a transistor 23 to 28; information is supplied either to input winding 29 of core 2, or through inputs 76 to 81 of the OR-circuits, and the transistor switches 37 to 40 are controlled to connect the writing wires 41 to 46 and/or the reading wires 42<SP>1</SP> to 47<SP>1</SP> in circuit, whereby information is read and written in different columns. Provision of the OR- circuits enables words of variable length to be written-in or read-out of the store. If information is desired only in the fourth to sixth columns of the store switches 38, 39 are initially opened and switches 37, 40 are closed, and a negative pulse is applied to input 78 of OR- circuit 19 from the address register (not shown). Transistor 25 is therefore made conductive and current flows from earth through switch 37, diode 50, transistor 25, winding 32, resistor R3, read wire 44<SP>1</SP>, diode 68 and switch 40 to the negative terminal. Information in the fourth column is thus read out, but information in the third column remains undisturbed. Core 5 is switched to positive remanence by the current in winding 32, the current thereby induced in output winding 14 maintaining transistor 26 non-conducting. Before arrival of the next shift pulse in winding 10, switch 37 is opened and switch 38 is closed, so that when the shift pulse arrives and core 5 is switched to negative remanence, rendering transistor 26 conductive, the current flows through write wire 44 and read wire 45<SP>1</SP>. Similarly the signal is passed along the chain to cores 6 and 7. Before the next shift pulse is applied to core 7 switch 40 is opened and switch 39 is closed, so that when the pulse arrives information in the sixth column is rewritten but the seventh column remains undisturbed. Finally switch 38 is opened and 37 is closed. By suitably controlling switches 37 to 40 information may similarly be read out, or written in, or read and rewritten in all or part of the store.