The project was led by John Mauchly, J. Presper Eckert, Jr., and their colleagues. 1985 : Microsoft announces Windows, according to Encyclopedia Britannica . The world’s oldest, original, still-working digital computer has been unveiled at the National Museum of Computing in Bletchley Park, the home of … ENIAC, the first programmable general-purpose electronic digital computer, built during World War II by the United States and completed in 1946. The Gavilan SC is the first portable computer with the familiar flip form factor and the first to be marketed as a "laptop." The world's oldest working digital computer has been restored, and is now on display at the National Museum of Computing at Bletchley Park, Milton Keynes. The identity of the first electronic digital computer is a matter that is often debated by technology historians and computer enthusiasts. After a three-year restoration project at The National Museum of Computing, the Harwell Dekatron (aka WITCH) computer will be rebooted on 20 November 2012 to become the world's oldest original working digital computer. On Tuesday, volunteers at Britain's National Museum of Computing rebooted the Harwell Dekatron -- a 2.5-metric-ton monster from the early 1950s -- making it the oldest working digital computer … The world's oldest original working digital computer springs back into action at TNMOC. The world's oldest original working digital computer will now go on display at The National Museum of Computing at Bletchley Park in Buckinghamshire.. In 1937, John Atanasoff and Cliff Berry, a professor and graduate student at Iowa State College, invented and built the first electronic digital computing device. A panorama view of the world's oldest original working digital computer at The National Museum of Computing. ENIAC was the most powerful calculating device built to that time. Delwyn Holroyd is leader of the restoration team and chair of The National Museum of Computing (TNMOC) volunteer committee. The Atanasoff–Berry computer (ABC) was the first automatic electronic digital computer. The 61 year old computer that refuses to retire. The first general-purpose computer (one that could be set-up to tackle any computational problem) was ENIAC, a computer built at the University of Pennsylvania that carried out its first calculations on 10 Dec 1945. Wasn’t widely known as the first automatic electronic computer until a lawsuit concluded so in 1973 against the ENIAC. Limited by the technology of the day, and execution, the device has remained somewhat obscure. Known to be the first automatic electronic digital computing computer; Was designed to solve up to 29 systems of simultaneous linear equations; Was likely the first electronic digital computer for solving math problems. 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