The design of the control unit of an electronic digital computer

Proceedings of the IEE - Part B: Radio and Electronic Engineering 04/1958; DOI: 10.1049/pi-b-1.1958.0267
Source: IEEE Xplore

ABSTRACT The function of the control unit of an electronic digital computer is to provide the sequences of pulses, which, when applied to the store, arithmetic unit and other units of the machine, cause the orders of the programme to be executed. The paper discusses a number of related ways in which a systematic and flexible design for a control unit may be achieved. In one group of systems the order code is determined by the arrangement of diodes in a diode matrix, and in another by the appropriate threading of wires through a matrix of ferrite cores. The first part of the paper is concerned with logical design, and the second part with the practical design of a system using a ferrite matrix.

  • [Show abstract] [Hide abstract]
    ABSTRACT: A substantial part of the intellectual content of what H A Simon called the ‘sciences of the artificial’ is contained in the activity we calldesign. A central aim ofdesign theory is to construct testable, explanatory models of the design process that will serve to enhance our understanding of how artifacts are, or can be, designed. In this paper, we discuss how some of the basic concepts underlying the discipline ofartificial intelligence (ai) can serve to provide anexplanatory paradigm for understanding design. We present an AI-based model of the design process and describe some of the implications of this model for our understanding of design — including that aspect of it we call ‘invention’.
    Sadhana 02/1994; 19(1):5-21. · 0.59 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The paper describes the principles of operation and the construction of storage units with a very short access time for reading. One form of the store which has been constructed has a capacity of 200 000 bits of permanent information and another has been built with a capacity of 100 000 bits, the whole contents of which may be changed in under one minute. The technique employed permits the construction of very large stores at low cost. Each digit cell is formed, basically, by two sets of windings which form the primary and secondary of a transformer and the two binary states are determined by the presence or absence of a piece of linear ferrite material coupling the windings. The access time is largely determined by the physical size of the store and the speed of operation of the associated circuits; a time of 100 millimicrosec is typical.
    Proceedings of the IEE - Part B: Electronic and Communication Engineering. 12/1960;
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents the design of a parallel digital computer utilizing a 20-¿sec core memory and a diode storage microprogram unit. The machine is intended as an on-line controller and is organized for ease of maintenance. A word length of 19 bits provides 31 orders referring to memory locations. Fourteen bits are used for addressing, 12 for base address, one for index control, and one for indirect addressing. A 32nd order permits the address bits to be decoded to generate special functions which require no address. The logic of the machine is resistor-transistor; the arithmetic unit is a bus structure which permits many variants of order structure. In order to make logical decisions, a ``general-purpose'' logic unit has been incorporated so that the microcoder has as much freedom in this area as in the arithmetic unit.
    Electronic Computers, IRE Transactions on. 07/1960;