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Atanasoff and Mauchly discussed the prototype ABC, examined it, and reviewed Atanasoff's design manuscript.
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Atanasoff and Mauchly
Judge Larson explicitly stated, " Eckert and Mauchly did not themselves first invent the automatic electronic digital computer, but instead derived that subject matter from one Dr. John Vincent Atanasoff ".
Between 1954 and 1973, Atanasoff was a witness in the legal actions brought by various parties to invalidate electronic computing patents issued to John Mauchly and J. Presper Eckert, which were owned by computer manufacturer Sperry Rand.
Atanasoff first met Mauchly at the December 1940 meeting of the American Association for the Advancement of Science in Philadelphia, where Mauchly was demonstrating his " harmonic analyzer ", an analog calculator for analysis of weather data.
Atanasoff told Mauchly about his new digital device and invited him to see it.
In June 1941 Mauchly visited Atanasoff in Ames, Iowa for four days, staying as his houseguest.
Mauchly visited Atanasoff multiple times in Washington during 1943 and discussed computing theories, but did not mention that he was working on a computer project himself until early 1944.
Atanasoff was put in charge of the project, and he asked Mauchly to help with job descriptions for the necessary staff.
In that case's decision, Judge Earl R. Larson found that " Eckert and Mauchly did not themselves first invent the automatic electronic digital computer, but instead derived that subject matter from one Dr. John Vincent Atanasoff ".
Atanasoff and ABC
The Atanasoff – Berry Computer ( ABC ) was the first electronic digital computing device.
The ABC was built by Dr. Atanasoff and graduate student Clifford Berry in the basement of the physics building at Iowa State College during 1939 – 42.
In 1939, John Vincent Atanasoff and Clifford E. Berry of Iowa State University developed the Atanasoff – Berry Computer ( ABC ), The Atanasoff-Berry Computer was the world's first electronic digital computer.
* The American Atanasoff – Berry Computer ( ABC ) ( shown working in summer 1941 ) was the first electronic computing device.
The ABC was dismantled by Iowa State University, after John Atanasoff was called to Washington, D. C. to do physics research for the U. S. Navy.
The federal judge who presided over the case ruled that " the subject matter was derived " from the earlier Atanasoff – Berry Computer ( ABC ).
According to Atanasoff, several operative principles of the Atanasoff – Berry Computer ( ABC ) were conceived by the professor in a flash of insight during the winter of 1937 – 1938 after a drive to Rock Island, Illinois.
In September 1942 Atanasoff left Iowa State for a wartime assignment as Chief of the Acoustic Division with the Naval Ordnance Laboratory ( NOL ) in Washington, D. C .; no patent application for the ABC was subsequently filed by Iowa State College.
Atanasoff and Atanasoff's
According to Atanasoff's account, several key principles of the Atanasoff – Berry Computer were conceived in a sudden insight after a long nighttime drive during the winter of 1937 – 38.
Letters he wrote to Atanasoff show that he was at one time at least considering building on Atanasoff's approach.
Mollenhoff's book gives the Atanasoff perspective of the 1973 federal court decision of Honeywell v. Sperry Rand that ruled the ENIAC computer patent invalid, and increased attention to Atanasoff's work.
Atanasoff and design
The mechanical and logic design was worked out by Dr. Atanasoff over the next year.
Atanasoff and .
However, its intermediate result storage mechanism, a paper card writer / reader, was unreliable, and when inventor John Vincent Atanasoff left Iowa State College for World War II assignments, work on the machine was discontinued.
Atanasoff and Clifford Berry's computer work was not widely known until it was rediscovered in the 1960s, amidst conflicting claims about the first instance of an electronic computer.
At that time, the ENIAC was considered to be the first computer in the modern sense, but in 1973 a U. S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the subject matter of the electronic digital computer from Atanasoff ( see Patent dispute ).
The memory of the Atanasoff – Berry Computer was a pair of drums, each containing 1600 capacitors that rotated on a common shaft once per second.
Although the Atanasoff – Berry Computer was an important step up from earlier calculating machines, it was not able to run entirely automatically through an entire problem.
This problem was not solved by the time Atanasoff left the university for war-related work.
Problems of this scale were becoming common in physics, the department in which John Atanasoff worked.
He submitted many of these problems to Atanasoff.
The case was legally resolved on October 19, 1973 when U. S. District Judge Earl R. Larson held the ENIAC patent invalid, ruling that the ENIAC derived many basic ideas from the Atanasoff – Berry Computer.
In 1997, a team of researchers led by John Gustafson from Ames Laboratory ( located on the Iowa State campus ) finished building a working replica of the Atanasoff – Berry Computer at a cost of $ 350, 000.
Machines such as the Z3, the Atanasoff – Berry Computer, the Colossus computers, and the ENIAC were built by hand using circuits containing relays or valves ( vacuum tubes ), and often used punched cards or punched paper tape for input and as the main ( non-volatile ) storage medium.
Mauchly and discussed
Eckert and Mauchly and the other ENIAC designers were joined by John von Neumann in a consulting role ; von Neumann summarized and discussed logical design developments in the 1945 First Draft of a Report on the EDVAC.
Mauchly and ABC
The ABC had been examined by John Mauchly in June 1941, and Isaac Auerbach, a former student of Mauchly's, alleged that it influenced his later work on ENIAC, although Mauchly denied this ( Shurkin, pg.
ENIAC co-inventor John Mauchly examined the ABC in June 1941, and its influence on the design of the later ENIAC machine is a matter of contention among computer historians.
Mauchly and Atanasoff's
Proponents for the court decision emphasize that the testimony established that Mauchly definitely had complete access to Atanasoff's machine and the documents describing it.
Mauchly and design
J. Presper Eckert and John W. Mauchly similarly were not aware of the details of Babbage's Analytical Engine work prior to the completion of their design for the first electronic general-purpose computer, the ENIAC.
Eckert and Mauchly started work on a new design, to be later called the EDVAC, which would be both simpler and more powerful.
ENIAC inventors John Mauchly and J. Presper Eckert proposed the EDVAC's construction in August 1944, and design work for the EDVAC commenced before the ENIAC was fully operational.
Mauchly led the conceptual design while Eckert led the hardware engineering on ENIAC.
Eckert and Mauchly, though they had started the design of EDVAC at the University of Pennsylvania, chose to leave and start EMCC, the first computer company.
* Barton was the first recipient of the ACM / IEEE Computer Society Eckert – Mauchly Award in 1979: For his outstanding contributions in basing the design of computing systems on the hierarchical nature of programs and their data.
However, new university policies that would have forced Eckert and Mauchly to sign over intellectual property rights for their inventions led to their resignation, which caused a lengthy delay in the EDVAC design efforts.
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