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It will take some effort to do justice to EMAS in these pages. There is a great deal of documentation available and we have recovered a considerable amount of EMAS source code from various places (more than is at that link! - it'll take some time to organise it on our web site).
EMAS, The Edinburgh Multi Access System, is a mainframe operating system which was designed around the time of Multics, and before the days of Unix, which was not only innovative for its time, but remained well ahead of the pack for years.
One of the primary drivers for this project was that there were significant software engineering lessons learned in the EMAS project which seem to have been forgotten. With luck this site will help some of our younger innovators avoid reinventing the wheel again.