Sommaire BIographie Honors and Awards Atanasoff Berry Computer

Sommaire BIographie Honors and Awards Atanasoff Berry Computer Time Line Annexes et References

ATANASOFF Physicien Américain 1903 -1995

John Vincent Atanasoff

Biographie v John Vincent Atanasoff was born on 4 October 1903 in Hamilton, New York. He is the inventor of the electronic digital computer. He is, along with being an Inventor, a Mathematical Physicist and a Businessman. v John Vincent Atanasoff is the first son of John Atanasoff and Iva Lucena Purdy. At a very early age, John Vincent Atanasoff had a great interest in mathematics. When John Vincent was about ten years old, he was curious in a Dietzgen slide rule that his father had bought. John Vincent read the instructions on how to use the slide rule, and he became more interested in the mathematical principles of the slide rule. With the help of his mother, John Vincent began to study a college algebra book that belonged to his father.

Biographie v In the years that followed, John Vincent's family moved to Old Chicora, Florida. John Vincent studied at Mulberry High School and graduated in two years. He received A's is all of his science and math courses. John Vincent did not enter into college right away because he wanted to work and save money. In 1921 John Vincent entered the University of Florida as an undergraduate. John Vincent graduated from the University of Florida in 1925 with a Bachelor of Science degree in electrical engineering. He received straight A's as an undergraduate. John Vincent Atanasoff then went to Iowa State College to pursue his master's degree. At Iowa State, John Vincent met his future wife, Lura Meeks. At the time, John Vincent did not know that she was three years his senior. John Vincent received his master's degree in mathematics from Iowa State College in 1926. Within a few days of receiving his degree, John Vincent and Lura Meeks were married.

Biographie: Etudes v He graduated from the University of Florida in 1925 with a Bachelor of Science degree in electrical engineering. v In 1926 he received his master's degree in mathematics from Iowa State College. v In 1930 he received a Ph. D. as a theoretic physicist at the University of Wisconsin. He became an associate professor of mathematics and physics at Iowa State College in 1936

Honors and Awards U. S. Navy Distinguished Service Award 1945 Citation, Seismological Society of America 1947 Citation, Admiral, Bureau of Ordnance 1947 Cosmos Club membership 1947 Order of Cyril and Methodius 1970 Iowa Inventors Hall of Fame 1974 Honorary membership, Society for Computer Medicine 1974 Doctor of Science, University of Florida 1974 Doctor of Science, Moravian College 1981 Governor's Science Medal 1985 Order of Bulgaria, First Class Award 1985 Computing Appreciation Award, EDUCOM, 1985 Holley Medal, American Society of Mechanical Engineers 1985 Coors American Ingenuity Award 1986

Atanasoff-Berry Computer: ABC • • Dès 1939, il travaille sur le projet avec un étudiant d'électrotechnique particulièrement intelligent: Clifford Edward Berry En décembre 1939, le premier prototype de l’Atanasoff-Berry Computer (ABC) était prêt; il s’agit du premier calculateur numérique électronique du monde Ce calculateur, a été le premier à utiliser le système binaire et était capable de résoudre des équations à 29 variables. Sa vitesse d'horloge était de 60 Hz; il faisait 1 multiplication à la seconde. Sa mémoire était de 60 mots de 50 bits Atanasoff et Berry décident de travailler à l’amélioration de ce prototype qui aurait dû être finalisé en 1943 Le projet s’arrête en 1942 avec le début de la Deuxième Guerre Mondiale

ABC John Atanasoff wrote most of the concepts of the first modern computer on the back of a cocktail napkin. He was very fond of fast cars and scotch. The prototype won the team a grant of $850 to build a full-scale model. They spent the next two years further improving the Atanasoff-Berry Computer. The final product was the size of a desk, weighed 700 pounds, had over 300 vacuum tubes, and contained a mile of wire. It could calculate about one operation every 15 seconds, today a computer can calculate 150 billion operations in 15 seconds. Too large to go anywhere, it remained in the basement of the physics department. The war effort prevented John Atanasoff from finishing the patent process and doing any further work on the computer. When they needed storage space in the physics building, they dismantled the Atanasoff-Berry Computer.

ABC • 4 principes de base pour son ordinateur: 1. 2. 3. 4. Il utiliserait l’électricité et l’électronique Contrairement à l’usage, il travaillerait sur une base binaire Il emploierait des condensateurs pour la mémoire et un processus régénérateur ou « impulsif » pour éviter les fautes qui pourraient être provoquées par la perte de puissance Il calculerait par action logique directe et pas par énumération comme utilisée dans des dispositifs calculateurs analogues (logique booléenne)

Diagrams

Atanasoff meets Mauchly John Atanasoff met John Mauchly at the December 1940 meeting of the American Association for the Advancement of Science in Philadelphia, where Mauchly was demonstrating his "harmonic analyzer". This was an analog calculator for analysis of weather data. Atanasoff told Mauchly about his new digital device and invited him to see it. Also during the Philadelphia trip, Atanasoff and Berry visited the patent office in Washington, where their research assured them that their concepts were new. A January 15, 1941 story in the Des Moines Register announced the ABC as "an electrical computing machine" with more than 300 vacuum tubes that would "compute complicated algebraic equations. In June 1941 Mauchly visited Atanasoff in Ames, Iowa to see the ABC. During his four day visit as Atanasoff's houseguest, Mauchly thoroughly discussed the prototype ABC, examined it, and reviewed Atanasoff's design manuscript in detail.

Atanasoff meets Mauchly Up to this time Mauchly had not proposed a digital computer. In September 1942 Atanasoff left Iowa State for a wartime assignment with the Naval Ordnance Laboratory in Washington D. C. He entrusted his patent application for the ABC to Iowa State College administrators. It was never filed. Mauchly visited Atanasoff multiple times in Washington during 1943 and discussed Atanasoff's computing theories, but did not mention that he was working on a computer project himself. Mauchly's own government work, he said, was too highly secret to reveal. John Mauchly's construction of ENIAC, the first Turing-complete computer, with J. Presper Eckert during 1943 -1946 thus led to the controversy over who was the actual inventor of the computer

TIME LINE 1978 Eshun Josh 2003 Eshun Leeroy 1926 Maîtrise en Mathématiques Iowa State College Ames Juillet 1930 Assistant à l. Iowa State College 1949 Chef Scientifique Army Field Force Mort 1921/25 Licence en Sciences Electrotechniques Fort Monroe, Maryland 15 Juin 1995 Université de Floride White Oak, Maryland Gainesville 1900 1910 1920 1930 1940 4 Octobre 1903 1930 Doctorat en Physique Théorétique ATANASOFF Madison, Wisconsin Naissance Monrovia, Maryland 1942 Rejoint NOL 1960 1952 Fonde OEC 1980 1990 2000 1973 Reconnu comme père de l’ordinateur 1956 Vice président AEC LEGENDE 1939/41 Conception de l’ABC avec Clifford Berry 1926 Epouse Lura Meeks 1970 1961 Retraite Vie privée Etudes Vie Professionnelle 1948 ABC détruit 1949 Epouse Alice Crosby ABC

Annexe et Références Lettre d’Atanasoff à Mauchly

References www. scl. ameslab. gov/ABC/Biographies. html www. cs. iastate. edu/jva-articles. shtml www. cs. iastate. edu/jva/books/mollenhoff/overview. html www. scl. ameslab. gov/ABC/Articles/First-computer. html www. thocp. net/hardware/abc. html www. recherche. enac. fr/~alliot/COURS/tsld 072. htm en. wikipedia. org/wiki/Atanasoff_Berry_Computer www. johnatanasoff. com www. cs. iastate. edu/jva/court-papers www. library. upenn. edu/exhibits/rbm/mauchly/jwm 7. html www. histoire-informatique. org/portraits/m. html#mauchly members. cox. net/dalehcook/starcity. shtml www. scienceandsociety. co. uk