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    Improvements in fixed digital data storage devices
    2.
    发明专利
    Improvements in fixed digital data storage devices 未知

    公开(公告)号：GB983952A

    公开(公告)日：1965-02-24

    申请号：GB323861

    申请日：1961-01-27

    Applicant: IBM

    Inventor： OWEN CHARLES EDWARD ,  PROUDMAN ANTHONY ,  HUFFELL JOHN GEORGE WILLIAM

    IPC: G11C17/02 ,  H03K11/00

    Abstract: 983, 952. Read-only stores. INTERNATIONAL BUSINESS MACHINES CORPORATION. Jan. 11,1962 [Jan. 27, 1961], No. 3238/61. Heading G4A. [Also in Divisions H1 and H3] A read-only memory used e.g. in storing microprograms consists in a set of ferrite cores C 0 C 1 . . . acting as pulse transformers arranged on the periphery of a disc with primary windings on selected subsets of the cores connected each between a pair of conductors taken one from each of two groups of drive conductors mounted on the disc. The two groups of drive conductors consist of radial conductors R N printed on the top surface of the disc and annular conductors AN printed on a lamination of the disc (Fig. 2). Terminals 9 project through the surface of the disc from conductors AN and receive one end of the primary windings. The other ends are attached to terminals 10 which are connected to the radial conductors R N through diodes D. There are three forms which the ferrite cores might take. In Fig. 1 U-shaped ferrites are each mounted with the limbs projecting from a recess in the periphery of the disc. The primaries are wound to pass between the limbs if the core is to be energized or to pass over a post 4 if the core is to be skipped. Ferrite bars bridge the limbs and are held in position by clips 3 attached to the posts 4. As shown in Fig. 3 the disc periphery carries nylon bushes 14 having projections 14a about which the primaries are wound. After this has been done a ferrite bar 16 is inserted and is capped by a U-shape ferrite member 18 held in place by a clip 17. In a third embodiment the cores may comprise teeth formed from a solid ferrite block comprising the disc periphery and grooved to accommodate the primaries. The cores are capped by ferrite bars as in Fig. 1

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