LEO I

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LEO I (Lyons Electronic Office I) - a British computer developed in 1951 based on the EDSAC machine, the first to carry out commercial calculations for business. The machine was launched at J. Lyons & amp; What. Ltd., which sponsored the EDSAC project. I had a 500 kHz clock, most of the instructions were done in 1.5 milliseconds. The speed of operation was limited by the input device, which was a paper tape. The mercury operating memory on delay lines, with 1K 35-bit words, was four times larger than in EDSAC.

Lyons initially used LEO I for valuations, but then expanded his payroll, inventory, and other business issues. One of the first tasks of the computer was to develop a day-to-day system, which was telephoned by the shops and provided the basis for calculating the night of the next day's production. This was the first example of a computerized customer service center. The LEO project was also a pioneer in outsourcing, as in 1956 the company began to make payroll calculations for Ford's Ford subsidiary. The key people developing LEO were David Caminer and John Pinkerton. David was responsible for the algorithms and systems implementation, while John was responsible for the hardware part.

LEO II

In 1954, the LEO II project was launched, and interest from the business led to the creation of LEO Computers Ltd., which was soon acquired by English Electric, resulting in the break-up of the LEO computer team. English Electric has been working on the LEO III and LEO 326 models, which allow simultaneous launch of several programs under the control of the operating system.

Some copies were commercially available in 1981. LEO Computers Ltd. has since merged with other companies in the meantime, creating ICT, and then ICL.

wiki

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