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EDSAC and ran
Overseen by Oliver Standingford and Raymond Thompson of J. Lyons and Co., and modelled closely on the Cambridge EDSAC, LEO I ran its first business application in 1951.
EDSAC was completed and ran its first program in May 1949.
On May 6, 1949 the EDSAC in Cambridge ran its first program, and due to this event, it is considered " the first complete and fully operational regular electronic digital stored-program computer ".
In October 1946, work began under Maurice Wilkes on EDSAC ( Electronic Delay Storage Automatic Calculator ), which subsequently became the world ’ s first fully operational and practical stored program computer when it ran its first program on 6 May 1949.

EDSAC and its
* May 6EDSAC, the first practicable stored-program computer, runs its first program at Cambridge University.
Since his laboratory had its own funding, he was immediately able to start work on a small practical machine, the EDSAC, once back at Cambridge.
Known as EDSAC 2 Autocode, it was a straight development from Mercury Autocode adapted for local circumstances, and was noted for its object code optimisation and source-language diagnostics which were advanced for the time.

EDSAC and first
The first configuration interaction calculations were carried out in Cambridge on the EDSAC computer in the 1950s using Gaussian orbitals by Boys and coworkers.
Later the project was supported by J. Lyons & Co. Ltd., a British firm, who were rewarded with the first commercially applied computer, LEO I, based on the EDSAC design.
There is a simulation of EDSAC available and a full description of the initial orders and first programs.
The board agreed that, as a first step, Lyons would provide Hartree and Wilkes with £ 3, 000 funding for the EDSAC project, and would also provide them with the services of a Lyons electrical engineer, Ernest Lenaerts.
In 1952, OXO ( or Noughts and Crosses ) for the EDSAC computer became one of the first known video games.
This concept was implemented for the first time in EDSAC 2, which also used multiple identical " bit slices " to simplify design.
Wilkes received the Turing Award in 1967, with the following citation: " Professor Wilkes is best known as the builder and designer of the EDSAC, the first computer with an internally stored program.
The Computer Laboratory built and operated the world ’ s first fully operational practical stored program computer ( EDSAC, 1949 ) and offered the world ’ s first taught course in computer science in 1953.
It was replaced by EDSAC 2, the first microcoded and bitsliced computer, in 1958.
In 1961, David F. Hartley developed Autocode, one of the first high-level programming languages, for EDSAC 2.
* EDSAC – world ’ s first practical stored program electronic computer ( 1949 – 1958 )
This lead to the development of a commercial version of EDSAC developed by Lyons, called LEO, the first computer used for commercial business applications.
Worsley wrote the program that generated a table of squares, the first program to successfully run on EDSAC.

EDSAC and on
Wheeler was a research student at the University Mathematical Laboratory at Cambridge from 1948 – 51, and a pioneer programmer on the EDSAC project.
Wheeler discusses projects that were run on EDSAC, user-oriented programming methods, and the influence of EDSAC on the ILLIAC, the ORDVAC, and the IBM 701.
Following the successful completion of EDSAC, the Lyons ' board agreed to start the construction of their own machine, expanding on the EDSAC design.
Its ultrasonic delay line memory based on tanks of mercury, with 2K ( 2048 ) 35-bit words ( i. e., 8¾ K bytes ), was four times as large as that of EDSAC.
It was developed on the EDSAC computer, which uses a cathode ray tube as a visual display to display memory contents.
A number of the attendees were to later go on to develop computers, such as Maurice Wilkes, of Cambridge, who built EDSAC.
In the early 1960s Peter Swinnerton-Dyer used the EDSAC computer at the University of Cambridge Computer Laboratory to calculate the number of points modulo p ( denoted by N < sub > p </ sub >) for a large number of primes p on elliptic curves whose rank was known.
It was on one of my journeys between the EDSAC room and the punching equipment that ' hesitating at the angles of stairs ' the realization came over me with full force that a good part of the remainder of my life was going to be spent finding errors in my own
Wheeler discusses the EDSAC project, the influence of EDSAC on the ILLIAC, the ORDVAC, and the IBM 701 computers, as well as visits to Cambridge by Douglas Hartree, Nelson Blackman ( of ONR ), Peter Naur, Aad van Wijngarden, Arthur van der Poel, Friedrich Bauer, and Louis Couffignal.
At about the same time, EDVAC was under development at the University of Pennsylvania's Moore School of Electrical Engineering, and the University of Cambridge Mathematical Laboratory was working on EDSAC.
His contributions to the field included work on the EDSAC and the Burrows-Wheeler transform.
Wheeler was a research student at the University Mathematical Laboratory at Cambridge from 1948 – 51, and a pioneer programmer on the EDSAC project.
Wheeler discusses projects that were run on EDSAC, user-oriented programming methods, and the influence of EDSAC on the ILLIAC, the ORDVAC, and the IBM 701.

EDSAC and May
It was on the boat home that Wilkes planned the original design of EDSAC, which was to become operational in May 1949.

EDSAC and 1949
Built in 1949, the EDSAC used a mercury delay line memory.
* EDSAC computer, 1949

EDSAC and when
The long-tailed pair has many attributes as a switch: largely immune to tube ( transistor ) variations ( of great importance when machines contained 1, 000 or more tubes ), high gain, gain stability, high input impedance, medium / low output impedance, good clipper ( with not-too-long tail ), non-inverting ( EDSAC contained no inverters!

EDSAC and numbers
Internally, the EDSAC used two's complement, binary numbers.

EDSAC and .
Electronic Delay Storage Automatic Calculator ( EDSAC ) was an early British computer.
EDSAC was the second usefully operational electronic digital stored-program computer.
As soon as EDSAC was completed, it began serving the University's research needs.
In 1953, David Wheeler, returning from a stay at the University of Illinois, designed an index register as an extension to the original EDSAC hardware.
The machine operators, who were present during the day, selected the next tape from the line and loaded it into EDSAC.
* In 1950, Dr. M. V. Wilkes and Wheeler used EDSAC to solve a differential equation relating to gene frequencies in a paper by Ronald Fisher.
* In 1952, A. S. Douglas developed OXO, a version of noughts and crosses ( tic-tac-toe ) for the EDSAC, with graphical output to a cathode ray tube.
* In the 1960s, EDSAC was used to gather numerical evidence about solutions to elliptic curves, which led to the Birch and Swinnerton-Dyer conjecture.
EDSAC's successor, EDSAC 2, was commissioned in 1958.
In 1961, an EDSAC 2 version of Autocode, an ALGOL-like high-level programming language for scientists and engineers, was developed by David Hartley.
In the mid-1960s, a successor to the EDSAC 2 was planned, but the move was instead made to the Titan, a prototype Atlas 2 — the latter having been developed from the Atlas Computer of the University of Manchester, Ferranti, and Plessey.
On the 13 January 2011, the Computer Conservation Society announced that it had commissioned a working replica of EDSAC, to be built at The National Museum of Computing ( TNMoC ) in Bletchley Park.
* An EDSAC simulator — Developed by Martin Campbell-Kelly, Department of Computer Science, University of Warwick, England.

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