ICL Direct Machine Environment

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 alternately 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 called 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

ICL2900 series

References

↑ "ICL woos old users with new software". New Scientist. 1997-04-28. Retrieved 2011-02-11.
↑ "TP3788 DME/3 and CME/3" (DJVU). ICL. Retrieved 2011-02-11.

International Computers Limited (ICL) 1968-2002

Predecessor mainframes	LEO I ICT 1301 Elliott 803 KDF8 KDF9

English Electric System 4 series	System 4/10 System 4/30 System 4/50 System 4/70 System 4/72 System 4/75

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 1909

ICL 2900 Series	2950 2955 2956 2960 2966 2970 2972 2976 2980 2982 2988 CAFS DAP OCP

ICL Series 39	Level 30 Level 50 Level 60 Level 80

ICL minicomputers	2903 2904 2905 ME29 System Ten System 25

ICL workstations	7502 7503 7561 DRS 20 DRS 100 DRS 200 DRS 300 DRS 400 DRS 500 DRS 3000 DRS 6000 PERQ One Per Desk

ICL operating systems	OpenVME VME VME/B VME/K superNova CME DME TME Executive GEORGE MAXIMOP MINIMOP J MultiJob

ICL programming languages	PLAN Fortran ALGOL 60 SOBS COBOL JEAN C Pascal S3 SCL SFL ApplicationMaster ReportMaster RPG DAP FORTRAN

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