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Atanasoff and Berry
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.
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.
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.
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.
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 Atanasoff-Berry computer is considered the first electronic digital computing device built by John Vincent Atanasoff and Clifford Berry at Iowa State University during 1937 – 1942.
* January 15 – John Vincent Atanasoff and Clifford E. Berry describe the workings of the Atanasoff – Berry Computer in print.
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