A virtual memory organisation for minicomputer process control software

  • Authors:

  • James D. Schoeffler;Lee Roy Bronner

  • Affiliations:

  • Systems Research Center, Case Institute of Technology, Case Western Reserve University, Cleveland, Ohio USA;Systems Research Center, Case Institute of Technology, Case Western Reserve University, Cleveland, Ohio USA

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 1973

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Abstract

The well known techniques of paged virtual memory provide an attractive base for the organization of process control software because the package can be organized as though a large memory were available but only those pages actually being used at any time need be present in the limited minicomputer memory. Such hardware is not available in minicomputers principally because of their limited word length. A software system for process control applications is implemented which takes advantage of virtual memory but avoids the inefficiency inherent in interpreting every address as a virtual address by partitioning the application programs intomodules which reside on single pages and use normal addresses for intra-module references. External references only are interpreted by the virtual space executive. Experimental results indicate that the system is efficient and attractive for this application.