Abstract: A bubble memory comprises a substrate with a major surface; a first storage module for storing bubbles on the left side of the surface having parallel inputs and parallel outputs; a second storage module for storing bubbles on the right side of the surface having parallel inputs and parallel outputs; a first input circuit on the left side of the surface including a serial-parallel track along which the bubbles move to the right to enter the parallel inputs of the first storage module; a second input circuit on the right side of the surface including a serial-parallel track along which the bubbles move to the left to enter the parallel inputs of the second storage module; a detector for detecting bubbles disposed equally on the left side and the right side of the surface; a first output circuit on the left side of the surface including a parallel-serial track which receives bubbles from the parallel outputs of the first storage module and moves them to the right to the detector; and a second output circuit on

Abstract: A method of operating a magnetic bubble memory (of the type that has a plurality of magnetic bubbles which move in a plane in response to a magnetic drive field that rotates in said plane) includes the steps of sending respective currents through a pair of field coils to produce the rotating magnetic field; generating at least one of the currents to consist of a series of positive and negative going waveforms separated by a dwell period so that the rotation of the field temporarily stops during the dwell period; and timing the dwell period to occur when the bubbles are at predetermined locations in the memory.