Comparison of single-element and double-element storage cells using continuous magnetic film

Practical comparisons of magnetic-film storage cells suitable for word-organised matrixes show that the usual cell, formed by the orthogonal intersection of one word conductor and one digit conductor (1W1D), can be replaced advantageously by a cell involving a pair of word conductors, carrying opposite currents, and a single digit conductor (2W1D). Compared with 1W1D cells, 2W1D cells tolerate more skew of the easy axis of the film; interactions between 2W1D cells in adjacent words are substantially lower, and those between adjacent cells in the same word are similar; and noise during reading of 2W1D cells is low, whether coupling between word and sense conductors is due to capacitance or to distortion in substrate eddy currents near plate corners. A 2W1D-matrix module has been made that is compatible with a previously described 1W1D module.