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It is believed that Archimedes invented the analog computer circa 100BC. An example of this was found by fishermen in the early 1900s on a shipwreck.

Charles Babbage invented the digital computer in the 1830s. This machine was mechanical but was never built, mostly because Babbage could not convince anyone to finance it.

John Vincent Atanasoff invented the electronic digital computer in 1937 in an Indiana bar. The machine was complete and operational in early 1942, but saw little use as Atanasoff and his assistant Clifford Berry were soon called away to war related work. The University soon scrapped it to make room for more classrooms, because although it was roughly the size of a desk and on casters it had mistakenly been built too wide to fit through a doorway.

Tommy Flowers invented the programmable electronic digital computer in 1943. Ten of these machines were used at Bletchley Park to break the German high command "fish" cypher.

The inventor of the modern stored program electronic digital computer is unknown and the exact date is unknown, but it was probably sometime in 1944. The idea came up in discussions on Project PX, the WW2 project to build ENIAC, but it was decided not to use it in ENIAC as this would delay construction. John von Neumann is often incorrectly credited with this invention as he wrote the first paper on it, which was prematurely released in draft form before proper credits could be given. The first such computer was not built until 1948 in Manchester, England.

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