ICL Direct Machine Environment

In today's world, ICL Direct Machine Environment is a topic that has captured the attention of many people. Whether due to its relevance in contemporary society, its impact on people's daily lives or its influence in the professional field, ICL Direct Machine Environment has become a crucial aspect that deserves to be analyzed and discussed. In order to fully understand this topic, it is important to examine its many facets and consider the different perspectives that exist on the matter. In this article, we will explore ICL Direct Machine Environment in detail, examining its importance, implications and impact on different aspects of everyday life.

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.

References

  1. ^ "ICL woos old users with new software". New Scientist. 28 April 1997. Retrieved 11 February 2011.
  2. ^ "TP3788 DME/3 and CME/3" (DJVU). ICL. Retrieved 11 February 2011.


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