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The Harvard Mark 1 is usually credited as being the first computer, but these were also early computers Comparison with other early computers {| |+ Defining characteristics of five first operative digital computers |- ! Computer ! Shown working ! Binary ! Electronic ! Programmable ! Turing complete | Zuse Z3 May 1941 Yes No By punched film stock Yes (1998) Atanasoff-Berry Computer Summer 1941 Yes Yes No No Colossus December 1943 / January 1944 Yes Yes Partially, by rewiring No Harvard Mark I - IBM ASCC 1944 No No By punched paper tape Yes (1998) ENIAC 1944 No Yes Partially, by rewiring Yes 1948 No Yes By Function Table ROM Yes

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17y ago

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