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Electronic Computers, IRE Transactions on

Issue 2 • Date June 1956

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Displaying Results 1 - 13 of 13
  • [Front cover]

    Page(s): c1
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  • IRE Professional Group on Electronic Computers

    Page(s): nil1
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  • [Breaker page]

    Page(s): nil1
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  • PGEC Papers Awards for 1955

    Page(s): 63 - 64
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  • A One-Microsecond Adder Using One-Megacycle Circuitry

    Page(s): 65 - 73
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    An analysis of the functional representation of the carry digits in the addition process shows that the one-megacycle circuitry of SEAC and DYSEAC can be organized logically to permit the formation of many successive carries simultaneously. The Boolean expression for any carry digit Ck can be expanded so as to be an explicit function of only the input digits of orders k to k-p+1 and of the carry digit Ck-p. Certain factorizations can then be made to simplify these expressions so that all of them fall within the limitations on the gating complexity imposed by the circuitry. A parallel adder utilizing this principle is developed which is capable of adding two 53-bit numbers in one microsecond, with relatively few additional components over those required in a parallel adder of more conventional design. View full abstract»

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  • A Small Coincident-Current Magnetic Memory

    Page(s): 73 - 78
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    This paper describes a small coincident-current memory used for buffer storage. Such a memory as part of the self-checking card-to-magnetic-tape converter, an auxiliary of the Univac System, is now in production. Typical advantages of a small coincident-current memory in computer input-output equipment, as well as some of the problems encountered in its application, are described. This memory affords the card-to-tape converter a great degree of flexibility, making it possible to read cards sidewise and to check and edit information with a minimum of hardware and complexity. Memory cells consist of metallic-tape cores wound with multi-turn coils. The low currents required permit operation of the memory directly from the card-sensing brushes on writing and from a diode function-table on reading. The functional aspects of the memory and its associated electrical circuitry are described. Information concerning the physical nature of the memory, specifications of the cores, and some of the tests performed in their inspection is also presented. View full abstract»

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  • Reflected Number Systems

    Page(s): 79 - 82
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    Many papers have been written about the reflected binary system and it is well known in the computer field for analog-to-digital conversion. The method used in creating this system may be extended to systems of bases other than two. It is the purpose of this paper to carry this extension to its logical conclusion. The author describes how reflected systems of different bases may be composed. The equations for translating between the conventional and reflected systems are then derived. It is also demonstrated how the reflected binary system is a special case of reflected number systems and how the general case simplifies for the reflected binary case. View full abstract»

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  • Analog Multipliers and Squarers Using a Multigrid Modulator

    Page(s): 82 - 85
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    This article describes the use of a multigrid vacuum tube as an AM multigrid modulator multiplier. The accuracy of the multiplier is dependent only upon the linear properties of the vacuum tube used and not upon careful adjustment of the operating potentials. It is unusual that such a simple device should give a range of 78 db with only a ±2 per cent full scale error. The advantages and also restrictions of this device along with a complete range of dynamic performance are included in this article. View full abstract»

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  • Transistors in Current-Analog Computing

    Page(s): 86 - 93
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    A system of electronic analog computing is described in which current is used as the variable. The paper indicates that the circuit properties of transistors make them especially suitable for use in operational amplifiers for this computing technique. Experimental direct-coupled amplifiers are shown which have been built and evaluated using low-power, low-frequency transistors. The amplifiers have been employed under laboratory conditions to perform the operations of summation, scale-change, integration, and differentiation. The factors which determine computing accuracy are analyzed, and a new technique of error prediction (based on square-wave output) is discussed. The paper concludes that the current-analog method promises to use transistors effectively. View full abstract»

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  • Contributors

    Page(s): 94 - 95
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  • PGEC News

    Page(s): 95 - 96
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  • Reviews of Current Literature

    Page(s): 97 - 109
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Aims & Scope

This Transactions ceased publication in 1962. The current retitled publication is 

IEEE Transactions on Computers.

Full Aims & Scope