ICL System 4 - meaning and definition. What is ICL System 4
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What (who) is ICL System 4 - definition

DEFUNCT BRITISH COMPUTER HARDWARE, COMPUTER SOFTWARE AND COMPUTER SERVICES COMPANY
Querymaster; International Computers Ltd; IDMS/X; IDMSX; International Computers Ltd.; Dataskil; TME (operating system); ICL Transaction Machine Environment; Executive (operating system); J (operating system); MultiJob; ICL operating systems; ICL ME29; ICL 2903 series; ICL 2903; ICL 2904; ICL 2905; System 25; ICL programming languages; ICL Concurrent Machine Environment; International Computers; QuickBuild; Icl.co.uk
  • Former ICL offices at Amsinckstraße 45, Hamburg, Germany. In 2013 the building was converted into a hotel.
  • ICL 2966 at the [[National Museum of Computing]]
  • Part of the computer hall at Bracknell in 1977
  • A System 4 system in 1975

English Electric System 4         
ICL System 4/75; ICL System 4; ICL System 4/72; ICL System 4/50; ICL System 4/10; ICL System 4/30; ICL System 4/70
The English Electric (later ICL) System 4 is a mainframe computer announced in 1965. It was derived from the RCA Spectra 70 range, itself a variant of the IBM System 360 architecture.
IDMSX         
<database> IDMS extended. (1995-04-19)
ICL DRS         
  • An ICL DRS20 terminal
DEFUNCT RANGE OF COMPUTERS
Distributed Resource System; Distributed resource system; ICL DRS 20; ICL DRS 100; ICL DRS 200; ICL DRS 300; ICL DRS 400; ICL DRS 500; ICL DRS 3000; ICL DRS 6000; ICL DRS Professional Workstation; ICL DRS PWS; DRS PWS; DRS Professional Workstation; DRS Professional Work Station
The ICL DRS was a range of departmental computers from International Computers Limited (ICL). Standing originally for Distributed Resource System, the full name was later dropped in favour of the abbreviation.

Wikipedia

International Computers Limited

International Computers Limited (ICL) was a British computer hardware, computer software and computer services company that operated from 1968 until 2002. It was formed through a merger of International Computers and Tabulators (ICT), English Electric Computers (EEC) and Elliott Automation in 1968. The company's most successful product line was the ICL 2900 Series range of mainframe computers.

In later years, ICL diversified its product line but the bulk of its profits always came from its mainframe customers. New ventures included marketing a range of powerful IBM clones made by Fujitsu, various minicomputer and personal computer ranges and (more successfully) a range of retail point-of-sale equipment and back-office software. Although it had significant sales overseas, ICL's mainframe business was dominated by large contracts from the UK public sector, including Post Office Ltd, the Inland Revenue, the Department for Work and Pensions and the Ministry of Defence. It also had a strong market share with UK local authorities and (at that time) nationalised utilities including the water, electricity, and gas boards.

The company had an increasingly close relationship with Fujitsu from the early 1980s, culminating in Fujitsu becoming sole shareholder in 1998. ICL was rebranded as Fujitsu in April 2002. The ICL brand is still used by the former Russian joint-venture of the company, founded in 1991.