GB981412A - Magnetic logical devices and systems - Google Patents

Abstract

981,412. Magnetic storage devices. MOTOROLA Inc. Sept. 28, 1962 [Oct. 16, 1961], No. 36930/62. Heading H1T. A transfluxor device having rectangular loop core as described in Specification 981,411, has first and second input windings 12, 13 (Fig. 1), which each link at least one minor aperture (such as 23, 24, 25) in each of the major flux paths defined by major apertures 17 and 18, these input windings 12, 13 passing in the same sense through the same minor aperture, e.g. 23 in one major flux path to provide a gate function and through minor apertures, e.g. 24, 25 in the other major flux path in senses to provide a negation of the gate function and an output winding 14 linking another minor aperture 27, 26 in each major flux path and in which a current is induced in one direction to represent the gate output and in the other direction to represent negation of the gate output. In the AND gate arrangement of Fig. 1, the core is blocked by a current from 31 which saturates it with a clockwise flux passing around the whole core outside the minor apertures and around the major apertures 17, 18 inside the minor apertures. X and Y currents through 12 and 13 then produce opposite effects at aperture 13 which cancel but switch the flux to an anti-clockwise direction round aperture 25 and cause the clockwise flux on the outside of aperture 26 to return inside this aperture and pass in an anticlockwise direction along member 22. The flux at aperture 26 is then switched by a priming current from 34 which produces an output in winding 14 insufficient to switch a succeeding core. The core is then again blocked by a current from 31 and transfers out the information at 26 in the form of a current XY in 14. Other input current combinations #XY, #X#Y produce the same output as X#Y above described. The combination XY however produces information at aperture 27 and an output current XY of the opposite direction to XY in winding 14. The input sources " X " and "Y" may be OR or AND devices as described or may be devices of the kind described in Specification 981,411, which can drive two AND gates if a further output winding is linked to other minor apertures 25, 28 (Fig. 3, not shown). To provide an OR gate instead of input winding 13 an input winding 43 (Fig. 4, not shown), linking apertures 28 and 24 is provided. An EXCLUSIVE OR device may be provided using two input windings both linking apertures 28, 23, 24, 25 (Fig. 5, not shown). A modified AND gate device also described has input windings 52, 53 (Fig. 6), both linking four minor apertures 54, 55, 56, 57 and presents a constant load to the input windings 52, 53.