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IBM Systems Journal

Issue 3 • Date 1969

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Displaying Results 1 - 6 of 6
  • A three-value computer design verification system

    Publication Year: 1969 , Page(s): 178 - 188
    Cited by:  Papers (17)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1440 KB)  

    The three-value simulator has been used on both rentral processing units and input/output controllers with microprogram control and hardware control. Four major systems have been simulated and built. The experience thus gained has indicated that: (1) It is possible to include simulation in a development cycle and as a result shorten that cycle, even in a changeable technology; (2) The efficiency of debugging hardware will improve because those testing the system have an opportunity to develop their troubleshooting techniques and to learn the computer system prior to the availability of hardware; (3) Logic problems that might otherwise remain undetected can be detected with three-value simulation; and (4) Future technologies will demand design verification simulators similar to the three-value simulator. View full abstract»

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  • Internal sorting with minimal comparing

    Publication Year: 1969 , Page(s): 189 - 203
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1967 KB)  

    The machine language implementation was derived from the APL function GRADE directly. The modeling process used to obtain the final machine language program eliminated a substantial number of defects before a machine language program even existed and gave an approximate idea of the performance of the machine language program. If an algorithm is to be implemented in machine language, it is recommended that it first he modeled in the fashion used in this paper, starting with a mathematical analysis of the algorithm, then obtaining successive algorithms at more detailed levels of description until the machine language program has been obtained. View full abstract»

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  • Problem formulation using APL

    Publication Year: 1969 , Page(s): 204 - 219
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1951 KB)  

    The APL formulation of a large-scale scientific problem can specify the solution precisely, while allowing the system much freedom in producing computed results. The testing and debugging stages of such application programming can be carried out at a terminal. The simplicity of APL helps the programmer see the main design of the problem by reducing the program size. In the problem-formulation phase, the APL programmer is aided by the mathematical consistency of the language and by the inherent explicitness of APL program statements from a mathematical point of view. View full abstract»

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  • Determining economic sampling plans

    Publication Year: 1969 , Page(s): 220 - 244
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2087 KB)  

    Multistage manufacturing processes are commonplace in industry. To ensure quality in the manufactured goods produced by such processes, some form of inspection is usually employed. Emphasis upon quality, while justified on its own merits, frequently makes the economic evaluation of inspection a secondary matter. The questions of where to eshblish inspection stations in a manufacturing process and how much inspection is necessary often are settled on a noneconomic basis. Yet, pricing and profit pictures are both influenced by answers to such questions. View full abstract»

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  • Authors

    Publication Year: 1969 , Page(s): 245 - 246
    Save to Project icon | PDF file iconPDF (889 KB)  
    Freely Available from IEEE
  • Abstracts

    Publication Year: 1969 , Page(s): 247 - 250
    Save to Project icon | PDF file iconPDF (1014 KB)  
    Freely Available from IEEE

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Throughout its history, the IBM Systems Journal has been devoted to software, software systems, and services, focusing on concepts, architectures, and the uses of software.

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