International Computers Limited

ICT was itself the result of a merger of two UK companies that had competed with each other throughout the 1930s and 1940s during the punched card era: British Tabulating Machine Company (BTM) and Powers-Samas. ICT had thus emerged with equipment that would process data encoded on punched cards with 40, 80 or 160 columns, compared to the 64 or 80 columns used by IBM and its predecessors.

In 1962, ICT delivered the first ICT 1300 series computer, its first transistor machine and also the first to use core memory. A small team from Ferranti's Canadian subsidiary, Ferranti-Packard, visited the various Ferranti computer labs and saw their work on a next-generation machine. On their return home they quickly produced the Ferranti-Packard 6000, developing the machine, compilers and an operating system (before these were common) and putting it on the market by 1963. A feature of the Executive operating system was its ability to multitask, using dynamic memory allocation enabled with a magnetic drum as an intermediate random access device. The machine went on to have some success and sold in small numbers in Canada (Saskatchewan Power Corporation retired serial number 0004 in early 1982) and the United States.

In 1964, ICT purchased the computer division of Ferranti in another government-forced merger. Ferranti had been building a small number of scientific machines based on various university designs since the 1950s. None of these could be considered commercially successful, however, and Ferranti always seemed to be slow bringing its designs to market.

Meanwhile, ICT management in England was looking to rejuvenate their line-up; their latest developments, the ones used to develop the FP 6000, were still not on the market. Management looked at the FP 6000 as well as licensing the RCA Spectra 70. In the end it was decided to go with the FP 6000 as the basis for a small line of small-to-midrange machines. The result was the ICT 1900 series, which would eventually go on to sell into the thousands.

The 1900 Series, which derived from the Canadian Ferranti-Packard 6000, competed successfully in the UK with the IBM System/360 range from the mid-1960s to the mid-1970s. The design was based on a 24-bit word, divided up into 6-bit characters. Lower case and control characters were provided for by "shift" characters. The early machines (1904/1905 with hardware floating point) had only 15-bit addressing. Later machines (1904E, 1905E, 1906A) had extended addressing modes, up to 22 bits.

The operating systems (Executives) were

• E4BM – the original for the FP 6000 (known internally as the FP1)
• E4RM – a significantly rewritten version of E4BM, with parts of the operating system overlaid to save space.
• E6BM – a rewritten version of E4BM for the later machines with 22 bit addressing.
• E6RM – a rewritten version of E4RM overlay software for the later machines with 22 bit addressing.

A later development was GEORGE3, remembered with great affection by a generation of British programmers.

A series of smaller machines were developed by the ICL Stevenage operation, consisting initially of the 1901 / 1902 / 1903 systems running E3 series executives (e.g. E3RM) and versions of the GEORGE operating system (initially GEORGE1). Later developments were the 1901A / 1902A / 1903A with their own Executives and GEORGE2.

At a time (in the 1960s and 1970s) when IBM/360 series programs had to be recompiled to run in different machine and/or operating system environments, one significant feature of the 1900 series was that programs would function unaltered on any 1900 system, without the need for recompilation. Unfortunately ICT, and later ICL, were unable to capitalise on this advantage to make significant inroads into IBM's customer base.

A System 4 system in 1975

During the same period, LEO was struggling to produce its own machines that would be able to compete with IBM. Its parent company, J. Lyons and Co., did not have the financial might to develop a new line of machines. Not wanting to see its work go to waste, it sold its computer division to English Electric.

English Electric had developed a series of machines over the years, notably the famous KDF9 and the commercially oriented KDF8, but never had much commercial success.

Now with serious financial backing at its disposal, the new company nevertheless decided not to come up with its own design, and instead licensed the RCA Spectra 70 (the design ICT rejected). The result was the System 4 series. While there were a number of models in the range, the smaller 4/10 and 4/30 were seen as underpowered, and the more successful variants were the larger 4/50 and 4/70 models. A model 4/75 was also supplied to the EELM (later Baric) Bureau subsidiary and installed at Winsford, Cheshire as the hardware for a bureau-developed commercial system for interactive use by bureau customers. Although several multi-user commercial packages (e.g. sales and purchase ledger systems) were developed and tried with customers, this was not commercially successful, and the service was soon withdrawn.

The System 4 series ran the J (for Job) operating system. This was a batch operating system, although there was a variant that allowed interactive access called MultiJob. Under a framework called Driver, J was a successful operating environment for high volume commercial real time systems. Programming languages used were assembler and COBOL and Fortran (an Algol 60 compiler was provided but not used much, if at all). The system was controlled from a console composed of a mechanical printer and keyboard – very like a Teletype. The assembly language (known as Usercode) non-privileged instruction set was identical to IBM System 360 Assembly Language; in privileged mode there were a few extras.

System 4's compatibility with the IBM 360 made it particularly attractive to customers in Eastern Europe and the Soviet Union, as the sale and installation of IBM computers (and other American technologies) there was politically sensitive and commercially restricted during the Cold War.

• LEO computer Leo 3 – origins in J. Lyons and Co.

• Elliott 4100 – a joint development with NCR Corporation. Transferred to ICL but sales and development ended soon after the formation of ICL.

The following remained with Elliott Automation and were never included in the formation of ICL:

• Elliott 503 – extensively used for academic and scientific work in British universities
• Elliott 803
• Elliott 901 / 920A
• Elliott 903 / 920B
• Elliott 905 / 920C
• Elliott 920ATC

The 900 series were 18 bit binary computers. The 90x series were commercial machines. The 920x series were built to military specifications and used in military aircraft, mobile field deployed air defence systems and tanks.

Series 39 followed the same essential architecture as 2900 series, but was a dramatic step forward in hardware technology. It was the first commercial mainframe to exploit optical fibres for central interconnect, and also introduced a multi-CPU (multinode) architecture transparent to the applications.

The series included:

• Level 30
• Level 50
• Level 60
• Level 80

The training video for the Series 39 featured the comedy duo Hugh Laurie and Stephen Fry.

ICL received the Queen's Award for Technological Achievement for the Series 39 in 1988.

At the inception of New Range development, two operating systems were planned: System B for the large processors, and System D for the mid-range. System B was subsequently renamed VME/B. A third operating system, System T, was subsequently targeted at small machines. System D was dropped in order to focus efforts on VME/B and System T, renamed to VME/K (Confusingly, VME/B was developed in Kidsgrove, VME/K in Bracknell.) The first large machines (the 2980 and 2970) were launched with VME/B. VME/K first saw service on the 2960.

The chief architect of VME/B was Brian Warboys, who subsequently became professor of software engineering at the University of Manchester. VME/B was developed using the pioneering software engineering system CADES as the development environment. The architect of CADES was David Pearson (computer scientist).

VME/K development continued independently for several reasons. Early VME/B customers suffered significant performance and reliability problems, and the existence of an alternative product provided a safety net. Perhaps more significantly, VME/K was the brainchild of Ed Mack, who had been brought in by managing director Geoff Cross as ICL's head of research and development. Despite his wide responsibilities, Mack took a detailed personal interest in every aspect of VME/K design. To quote historian Martin Campbell-Kelly, "Mack had a good deal more autonomy than was good for the company." Not only was too much resource going into VME/K at the expense of the VME/B system that ICL's biggest customers were actually using, but the development of mainframe systems was also diverting expenditure from small business systems such as the 2903, whose sales were growing much more rapidly.

ICL's finances deteriorated during the late 1970s, leading to the appointment of a new management team led by Robb Wilmot and Peter Bonfield. One of their first actions was to end VME/K development. This happened just at the time that VME/K had finally reached a level of performance and reliability that made it saleable; however, the customer base was very small, and by this time VME/B (which was renamed VME 2900) had also matured sufficiently to give confidence that it would meet the future requirements for the entire mainframe range.

VME 2900 subsequently became simply VME and then Open VME, and continued to evolve. In 1980 it was marketed as "Your system for the 80s", and indeed that decade proved to be its heyday. It continued to give service to many loyal and demanding users, but has attracted few new users since 1990 or so.

ICL used the term superstructure to refer to the compilers, data management tools, and transaction processing software sitting above the operating system but below the user application – a category now often labelled middleware.

The 290x operating system, known as 'Executive', allowed the machines to be operated 'manually' via a video console. GEORGE1* ran on top of Executive to control batch processes by means of JCL (Job Control Language), which was based very closely upon the macro language of the 1900 GEORGE1S operating system.

TME was the operating system on the ME29 and required CL (Control Language) to run jobs – 'manual' operation being discouraged.

Practically all the software packages available on the 1900 range ran on the 290x and ME29 systems.

In about 1982, a new Transaction Processing System TME-TP was introduced for the ME29, with a subset of the facilities of TPMS (cf 2900 software).

TME came bundled with a hierarchical database management system called RAPID (Record Access Program Independent of Data). This was built around 1900 IDMS, and consisted of a set of user interfaces which provided a "user friendly" graphical database schema design and configuration environment, and an RML COBOL-based programming environment. Everything was compiled into the equivalent 1900 IDMS objects for use at run time.

Dataskil Ltd or ICL Dataskil was a software house, formed from an internal department known as the User Programming Service (UPS), that developed commercial programs and some utility software for the ICL marketplace. Dataskil also provided consultants and project teams to work on ICL's or direct clients' 1900 and 2900 projects. There were several divisions within Dataskil, including Consultancy Services, Transition Services, Project Management Services (PMS), etc.

Dataskil software products included:

For 1900 series	For 2900 series	Others
1900 Datadrive 1900 Datafeed 1900 Dataview 1900 IDMS 1900 Filan	2900 IDH (Interactive Data Handler) 2900 LP (Linear Programming) 2900 OMAC 2900 PERT Applications Manager	Wordskil

The ICL 1900 Filan manual (1st edition January 1973) describes Filan as:

"a totally integrated system for the analysis of large quantities of complex data such as that collected in censuses and other surveys".

It was used to process the 1971 Indonesian Population Census.[14] In the UK, Filan was used during the 1970s by the Office of Population Censuses and Surveys to process the General Household Survey data. As there was only a small user community, ICL decided not to convert the software to run on its 2900 range of computers in the 1980s.

This was a joint venture of International Computer Services Ltd (ICSL), a division of ICL, and Barclays, that provided computer services. In the early days of computing many organizations avoided the capital costs of purchasing their own equipment and the recruitment of technical specialists by putting their work out to service companies, such as BARIC, which were known as computer bureaux. BARIC also ran special groups such as the Advanced Videotex team, which investigated how new technologies such as Prestel could be leveraged.

This company operated two ICL 1900 mainframes (1904E and 1905S, in manual and GEORGE II operating system modes) from its head office in Newman Street, London. This site housed management, sales and support staff and a large programming team (site closed late 1975). Sales and support offices were in Belfast, Birmingham, Bristol, Cork, Dublin, Glasgow, Stoke-on-Trent, Leeds, Forest Gate, Hartree House Queensway, St Paul's Churchyard, Putney (ICL headquarters) and Manchester. The Queensway site was above Whiteleys department store, and had been used in the 1950s and 1960s by the LEO arm of food company J. Lyons to run data processing and an early bureau service.[15]

Chris Gent was the managing director from 1979 to 1985, when he left to lead Vodafone. In 1985 most of BARIC's bureau business was acquired by CMG (Computer Management Group).

ICL had established a presence in India in its earliest days, through International Computers Indian Manufacture Ltd (ICIM), a partly owned subsidiary. As the name implies, ICIM took on some of the manufacturing of ICL-designed equipment, generally for overseas markets. In later years ICIM, from its offices in Pune, started to establish a presence in the market for offshore software development and eventually outsourcing of the operation of computer services. ICIM subsequently became a joint operation with Fujitsu, establishing links to Japan that were as strong as its traditional links to the UK. Reflecting the shift in its business, the company was renamed ICIL (International Computers India Limited), and again in 2000 to Zensar Technologies, a publicly traded company which has RPG Group as its largest shareholder.

DESC Ltd (subsequently ICL DESC Ltd.) was a subsidiary focused on defence systems spun out from ICL at the time of the Fujitsu takeover, to avoid concerns over defence systems ownership by the Japanese firm. These qualms were overcome and eventually it was merged back into the parent company.

iBANK Systems was a joint venture with Xcelsoft, Inc. of Canada to develop a Unix-based integrated retail banking system capable of distributed operation. Supported platforms included the DRS-6000 and DRS-3000, and the product was written in COBOL with some 'glue' written in C. The international team was based in Greenville SC, US.

The venture lasted from 1992 through 1995 when the two companies dissolved the relationship and each went forward independently, thereby forking the project. The ICL branch was renamed Fujitsu-ICL International Banking Products, and continued operations until 2000 when ICL withdrew completely from operations in North America. Customers of iBANK Systems included Moscow Savings Bank (Russia), Suprimex (Russia), Chelindbank (Russia, project cancelled at the try-test phase), Mineral Bank (Bulgaria), Romanian Bank for Development (Romania), PTC (Zimbabwe), People's Own Savings Bank (Zimbabwe), Mutual Bank of the Caribbean (Barbados), National Commercial Bank (Jamaica), and Caisse Populaire (Canada).

Early in 1976, ICL acquired the international (that is, non-US) part of Singer Business Machines.[16] The Singer group, a holding company which had diversified by adding many divisions, the most well-known of which was its early roots in sewing machines, and others such as the Business Machine division which was acquired by purchasing Friden, a San Leandro computer company, whose flagship product was the System Ten, a small business minicomputer. SBM had also acquired Cogar Corporation, a manufacturer of desktop intelligent terminals in Utica, New York, which after the ICL acquisition became the development and manufacturing plant for both minicomputers and terminals. The acquisition shifted the geographical balance of ICL's sales away from the UK, and also gave a presence in industry markets such as retail and manufacturing. ICL subsequently developed the System Ten into the System 25, and used the product to spearhead the growth of its Retail Systems business during the 1980s.[17][18]

ICL was in financial difficulty in 1981, with weak export performance against American and Japanese competition, and a takeover by an American manufacturer seemed likely. Christophor Laidlaw, deputy chairman of BP, was appointed as chairman and achieved a financial reconstruction, supported by loan guarantees from the government; he also oversaw the start of a technology agreement with Japan's Fujitsu.[19] In 1984, Laidlaw was succeeded by Sir Michael Edwardes, previously chairman of motor manufacturer British Leyland.[19]

On 26 July 1984 a £400 million takeover bid for ICL arrived from Sir Kenneth Corfield, head of Standard Telephones and Cables.[20] The stated rationale was the predicted convergence of computers and telecommunications. The ICL board recommended acceptance of the bid, and the takeover was completed on 10 September. Sir Michael Edwardes, who had been chairman for just six months, resigned, and Laidlaw returned briefly as chairman. Robb Wilmot, who had arrived as managing director in 1981 (at the age of 36) remained, along with Peter Bonfield as marketing director.

The takeover caused losses at STC, leading in 1985 to a rights issue[20] and Corfield's replacement by Lord Keith as STC chairman, with Arthur Walsh as chief executive. Wilmot resigned, and Bonfield was appointed chairman and managing director of ICL. Within a few years ICL was contributing 60% of the profits and turnover of the combined group. Bonfield was appointed CBE for his role in turning the company around.

In 1988 STC acquired US retail systems specialist Datachecker Systems from National Semiconductor Corporation. At the time this was the second largest supplier in the US retail market, and greatly expanded ICL's US presence.

In 1989, ICL acquired Regnecentralen of Denmark, a company with a distinguished history and reputation in that country, but which was best known internationally for its front-end communications handling equipment.

Also in 1989 STC acquired CCI, suppliers of ICL's Clan 5, 6 and 7 ranges (later DRS 500) and originator of OfficePower. By 1990 CCI's Computer Products Division in Irvine, California, and Office Products Centre in Reston, Virginia, had been transferred to ICL.[21]

In 1991 ICL acquired Nokia Data, part of Nokia. Nokia Data was itself the result of Nokia's mid-1980s acquisition of Ericsson Information Systems, whose origins lay in the purchase by Ericsson of the computer business of Saab, known as Datasaab. ICL's acquisition (at a price of around £250m) added 9,500 employees to the company (7,000 of them in Finland and Sweden), and brought with it a PC manufacturing capability, a suite of desktop software products, and more importantly a strong presence in the Nordic market and an awareness of the high-volume end of the IT market.

In July, 1991 ICL acquired more than half of the Russian company KME-CS (Kazan Manufacturing Enterprise of Computer Systems, Kazan, Tatarstan, Russia). The agreement was signed between Peter Bonfield (President of ICL) and Mintimer Shaimiev (President of the Tatarstan Republic).

ICL's relationship with Fujitsu started in 1981, when ICL needed a cheaper source of technology to develop lower-end machines in the 2900 range to compete with the IBM 4300 series. At this stage ICL was developing its own LSI technology for use in the higher-end machines, designed as a successor to the highly successful 2966 processor (known internally as S3). ICL had visited a number of companies during 1980, including Fujitsu and Hitachi, to identify potential suppliers.

As part of the 1981 restructuring, Robb Wilmot – an electronics engineer and former head of Texas Instruments' British-based calculator operation – arrived as CEO in May 1981.[22][23] He cancelled in-house LSI technology development, and negotiated an agreement that gave access to Fujitsu's LSI and packaging technologies, which, when combined with ICL's in-house CAD capability, enabled ICL to design and manufacture the DM1 and Estriel machines, later marketed profitably as Series 39 level 30 and 80.

Initially the collaboration with Fujitsu was presented as being an arm's length one, to avoid diluting ICL's credentials as a European and British company. However, Fujitsu's involvement with ICL at both the financial and the technical level steadily increased over the subsequent two decades, and in 1990 Fujitsu acquired 80% of ICL plc from its parent STC plc, paying US$1.29 billion. In 1998 Fujitsu became ICL's sole shareholder[24] and the ICL brand was dropped in 2002.[25][26][27]

Following the acquisition of Nokia Data in 1991, personal computers and servers were marketed under the ICL brand. This changed when Fujitsu Siemens Computers was formed in 1999 as a joint venture between Fujitsu and Siemens. The joint venture absorbed all ICL's hardware business with the exception of VME mainframes, and all the business of Siemens Nixdorf with the exception of its banking and retail systems. Fujitsu Siemens was merged back into Fujitsu in 2009.

PC Interworks was incorporated in October 1995. It was created as a sales company, selling personal computer and other IT equipment to the employees of large organisations. The company, which evolved from a concept developed within ICL, began business with a contract from ICL to provide computer related products to its staff, as a part of its Employee Benefit Programme. PC Interworks was subsequently absorbed by International Computer Logistics Limited.

International Computer Logistics, a British company specializing in IT repair and data recovery, secured the intellectual property rights to the ICL brand in 2014. It is based in Kidsgrove, North Staffordshire and was formed in 2012.[28]