Basic deposited integrated magnetic circuit element for fast computer circuitry

A deposited configuration, consisting of a magnetic thin film and coupling loop, was studied with a view to the future development of integrated magnetic circuitry. A line charge model, predicting flux linkages of coupling loops to an accuracy of about one percent was established. The almost complete linkage of the film flux with a deposited loop, due to the very close coupling, was verified. A decrease of about 20 percent in film flux at both ends of the easy axis was noted for the experimental assemblies used. Circulating loop currents were shown to be the chief parasitic factor which modified the switching of the magnetic film. The change in switching time due to eddy currents was small when the loop conductor size was of the same order as the magnetic film. For resistive loop loading, the average field during switching is a good measure of the slowing due to the loading. The film-loop assembly has good potentialities as a circuit element, with good transmission of both read-out and control signals occurring in the loop. The field calibration for these control signals was shown to be the same for both bias and drive field applications

Design and evaluation of a glass delay line content-addressable memory system

The high cost of content-addressed memories (CAM) can be reduced significantly by using a circulating memory system. With the circulating system, comparison logic is shared by many memory locations to allow a reduction in cost. Three data organizations are described and evaluated and one is chosen as the best for implementation when 20 MHz, 100 μsec glass delay lines are used. The complete design of a CAM system is described which has a 2048 x 35-bit capacity and is capable of searching the entire contents in 100 μsec. Search criteria include equality and magnitude conditions. Operations include storing, fetching, and a variety of tagging functions. The described CAM has been constructed and installed as an operating addition to a general-purpose serial computer, the NEBULA. The CAM system has been a powerful addition to the NEBULA and a similar system could be a useful yet economical addition to any computer system

Space Communications: Theory and Applications. Volume 3: Information Processing and Advanced Techniques. A Bibliography, 1958 - 1963

Annotated bibliography on information processing and advanced communication techniques - theory and applications of space communication

NBS monograph

From Introduction: "This is the third in a planned series of reports involving selective literature reviews of research and development requirements and areas of continuing R & D concern in the computer and information sciences and technologies.