- ICL Direct Machine Environment
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Direct Machine Environment, abbreviated DME, was a mainframe environment for the ICL 2900 Series of computing systems from International Computers Limited that was developed in the 1970s. DME was more-or-less an ICL 1900 order code processor in microcode, which permitted the ICL 1900 series executive, operating systems and program libraries to operate on the ICL 2900 series.[1][2]
Reason for Development
At this time most companies that had computers had large teams of programmers to write their applications. DME was developed so that customers could buy the new hardware and run their 1900 or System 4 applications whilst they developed their replacement VME applications. This led to some users running DME and VME on the same machine for some years. Unfortunately this led to situations where development teams were waiting around for time to run their new applications. This, and the fact that some users were not moving to the new system, led ICL to develop a system call Concurrent Machine Environment (CME) under which VME ran DME as a subsystem, enabling 1900 and System 4 applications to be run on a 2900 or Series 39 machine alongside VME applications.
External links
References
- ^ "ICL woos old users with new software". New Scientist. 1997-04-28. http://books.google.com/books?id=Kbm3IWKnstMC&pg=PA198&lpg=PA198#v=onepage&q&f=false. Retrieved 2011-02-11.
- ^ "TP3788 DME/3 and CME/3" (DJVU). ICL. http://www.icl1900.co.uk/techpub/tp3788.djvu. Retrieved 2011-02-11.
International Computers Limited (ICL) 1968-2002 Predecessor mainframes English Electric System 4 series ICT 1900 series 1901 • 1901A • 1901S • 1901T • 1902 • 1902A • 1902S • 1902T • 1903 • 1903A • 1903S • 1903T • 1904 • 1904A • 1904E • 1904F • 1904S • 1905 • 1905E • 1905F • 1906 • 1906A • 1906E • 1906F • 1906S • 1907 • 1907E • 1907F • 1908 • 1909ICL 2900 Series ICL Series 39 ICL minicomputers 2903 • 2904 • 2905 • ME29 • System Ten • System 25ICL workstations ICL operating systems ICL programming languages PLAN • Fortran • ALGOL 60 • SOBS • COBOL • JEAN • C • Pascal • S3 • SCL • SFL • ApplicationMaster • ReportMaster • RPG • DAP FORTRANThis operating system-related article is a stub. You can help Wikipedia by expanding it.