computer history.ppt

7/27/2019 computer history.ppt

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chocolate

hotdoghumberger Paper clip


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The Atanasoff computer was approximately the size of a large desk. Ithad approximately 270 vacuum tubes. Two hundred and ten tubescontrolled the arithmetic unit, 30 tubes controlled the card reader andcard punch, and the remaining tubes helped maintain charges in the

condensers. The Atanasoff computer employed rotating drum memory. Each of thetwo drum memory units could hold about thirty fifty-bit numbers.

The computer operator's console contained a series of buttons,meters, lights and controls, mounted on top of the computer's metalframe. The Atanasoff machine was used to solve linear equations.

Dr. John V. Atanasoff had been interested in mechanizing the process

of calculation since 1935. In 1939, he received a research grant of $650to build a prototype of a computer he had designed for solving linearequations. Atanasoff, along with Clifford Berry, a graduate student,developed the first working prototype electronic digital computer.Before this time, computing devices had been either mechanical,electromechanical, or analog based.

The ABC computer, as it was later called, was the first electronic

digital computer. Although it was a very significant technicalachievement, the machine had a variety of limitations. It was slow,required constant operator monitoring, and was not programmable. In1948, the original ABC computer was dismantled by Iowa StateUniversity officials, without the knowledge of Atanasoff. Only a feworiginal components survived.


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built by Konrad Zuse from telephone relays. Work started

approximately 1934. Destroyed in the WW-II. This is the first

electronic computer, thus preceeding ENIAC and ABC (Atanasoff-Berry Computer).


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The Cray 1 Supercomputer


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The Cray-1 Supercomputer

(designed by Seymour Cray of Cray

Research, Eagan, Minnesota) was

the first computer capable of

performing over 100 million floating-

point calculations per second. Of the

many technological problems thathad to be solved, one of the most

important was how to remove the

heat generated by the high-speed

logic. This was accomplished by

mounting the circuits on vertical

plates that were cooled by a freon

refrigeration system. Although faster

machines have now been built, theCray-1 continues to be used for

mathematical studies of very

complex problems, such as speech

analysis, weather forecasting, and

fundamental questions in physics

and chemistry. The Cray-1 also

leaves its mark as the informal unit of

measure for newer supercomputers,

some of which are now projected to

equal 1,000 Crays.

Cray 1 Supercomputer


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Cray-1 Supercomputer


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computer history.ppt

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