Browsing Project Whirlwind Reports by Creator "Raffel, J."

Now showing items 1-5 of 5

    • Core Memory Using External Bit Selection 

      Raffel, J. (Lincoln Laboratory - Division 6, 1954-03-18)
      A memory system in which the memory functions (remanence) and the selection function (nonlinearity) are performed in separate cores may have the following advantages over the present (coincident-current) system: 1) Much ...

    • Experiments on a three-core cell for high-speed memories 

      Raffel, J.; Bradspies, S. (Lincoln Laboratory - Division 6, 2009-06-15)
      The coincident-current magnetic-core memory was suggested in 1949 by Jay W. Forrester as a reliable, random-access storage medium. Development of the first working memory of this type, for the Memory Test Computer at M.I.T., ...

    • Proposal for Reducing the Number of Tubes Used in Driving a Magnetic Matrix Switch 

      Raffel, J. (MIT Digital Computer Laboratory, 1953-07-09)
      A scheme is outlined which eliminates roughly half the bias drivers used in present models of the magnetic matrix switch. It calls for an increase of about 50% in the number of wires passing through a core in the switch.

    • Sensing Winding Geometry 

      Raffel, J. (Lincoln Laboratory - Division 6, 1953-08-06)
      The difference between the minimum wanted output (a system ONE) and the maximum unwanted output (a system ZERO) is the same for a winding which threads the cores so that each half of the memory plane has a different polarity ...

    • Switch-Core Design and Power Loss 

      Raffel, J. (Lincoln Laboratory - Division 6, 1953-08-07)
      Criteria for design of switch cores to be used in a magnetic-matrix switch are established. Core loss is shown to depend only on the average value of net ampere-turns excitation if certain assumptions are made about memory ...