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List of operating systems
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===International Computers Limited=== * [[J (operating system)|J]] and [[MultiJob]] β for the System 4 series mainframes * [[GEORGE (operating system)|GEORGE]] 2/3/4 GEneral ORGanisational Environment β used by [[International Computers Limited|ICL]] [[ICT 1900 series|1900 series]] mainframes * [[Edinburgh Multiple Access System]] (EMAS) for the [[ICL System 4/75]], from the [[University of Edinburgh]], later ported to other systems. * [[Executive (operating system)|Executive]] β used on the 1900 and 290x range of minicomputers. A modified version of Executive was also used as part of GEORGE 3 and 4. * [[TME (operating system)|TME]] β used on the ME29 minicomputer * [[ICL VME]] β including early variants VME/B and VME/2900, appearing on the [[ICL 2900 Series]] and Series 39 mainframes, implemented in [[S3 programming language|S3]] * [[VME/K]] β on early smaller 2900s
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