High Speed Ferrite 2v2d Memo'ry

Main core storage in digital computers has been getting both larger and faster with each generation. In view of this a design was undertaken which would be inherently faster, and inherently less expensive in the large sizes. Other significant inputs to the design approach chosen was that electronics, that is semiconductors, were becoming less expensive; also, to operate at the higher speeds smaller cores must be used. Since it is progressively more difficult to put additional wires through these smaller cores, system approaches using fewer wires through the core were studied. The system chosen has basically a two-dimensional magnetics array similar to linear select; however, it has the advantage that it has a level of decoding in the array. Therefore a significant saving in electronics over the liner select may be affected, while maintaining the inexpensive magnetics array. Shown in Fig. 1 is how the relatively inefficient aspect ratio of linear select arrays may be improved by dividtug the word dimension by some number and, while multiplying the bit dimension by the same riumber, get a squarer array. The chosen system has a coincident current read cycle, and a linear select write cycle, that is, the digit current is additive rather than subtractive. Since