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The Computer Journal 1973 16(4):331-346; doi:10.1093/comjnl/16.4.331
© 1973 by British Computer Society
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EMAS—The Edinburgh Multi-Access System

H. Whitfield * and A. S. Wight

Department of Computer Science, University of Edinburgh, The King's Buildings, Mayfield Road, Edinburgh, UK

EMAS is a general-purpose time-sharing system for the ICL System 4-75 computer, with provision for fully interactive and background processing. It is a virtual memory system with a three level storage hierarchy.

An outline description of the system is given together with a more detailed description of the paging and scheduling software, which is based on the working set concept. Detailed performance figures are included.

Received October 1972.

* Present Address: Mathematisch Instituut, Rijskuniversiteit te Groningen, Postbus 800, Groningen, The Netherlands.

§ Department of Computer Science, University of Edinburgh, The King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, Scotland


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