The evolution of the operating system EMAS 2900
@article{Stephens1980TheEO, title={The evolution of the operating system EMAS 2900}, author={P. D. Stephens and J. K. Yarwood and D. J. Rees and N. H. Shelness}, journal={Software: Practice and Experience}, year={1980}, volume={10} }
As a result of experiencing problems with manufacturer's software on the early 2900 machines Edinburgh University took the bold step of attempting to move the general purpose timesharing system EMAS from an ICL 4–75 to an ICL 2970 computer. This paper describes the move together with the changes made and includes some preliminary performance figures from the new system. This implementation project has produced a major time‐sharing virtual memory operating system with a fraction of the effort…
6 Citations
The kernel of the EMAS 2900 operating system
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It is shown that the concept of local and global control of resources can lead to a considerable simplification in the structure of an operating system kernel.
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This paper describes the integration of initially one, and later a second, ICL Distributed Array Processor (DAP) into a dual ICL 2972 installation running the Edinburgh Multi‐Access System (EMAS).…
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The integration of two ICL Distributed Array Processors into a dual ICL 2976 configuration running the Edinburgh Multi‐Access System (EMAS) provides effective control and use of the DAP resource while allowing multi‐user access to the D APs for DAP program development.
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This paper identifies what the two methods have in common, namely that the implementation is the second time through carefully thinking about the problem, and proposes that perhaps this common aspect is more important to the successes of the methods than other aspects of the method.
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