Defect tolerant scheme for a bubble lattice file

Details Defect tolerant scheme for a bubble lattice file Defect tolerant scheme for a bubble lattice file

1978-06-23

1979-12-18

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Disposition of elements

365 35, G11C 1908

Patent

active

041797493

ABSTRACT:
A defect tolerant lattice file memory having means in the access column for annihilating lattice bubbles in a previously detected defective row thus eliminating an error in the digital information to be extracted from the lattice file. This annihilation means comprises a ladder formed in a conductor overlay located over the access column in which partial current loops may be formed by disconnecting certain selected portions of the ladder. These current loops create a localized magnetic field when the ladder conductor is activated thus annihilating the selected row of bubbles. Thus, lattice file chips found to have defective rows which will not support and maintain lattice bubbles in their desired coded state can now be utilized.

REFERENCES:
IBM Technical Disclosure Bulletin-vol. 18, No. 8, Jan. 1976, pp. 2673-2674.
IBM Technical Disclosure Bulletin-vol. 17, No. 12, May 1975, pp. 3767-3772.

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