3 янв 1941 г. - 1941-1950, German Konrad Zuse finishes the Z3, a fully program operational calculating machine the computer is publically introduced in berlin may 12, 1941, John Atanasoff successfully tests the Atanasoff-berry computer which was the first computer to use regenerative capacitor drum memory, ENIAC began to be constructed and completed in 1946, Mark 1 colossus became operational on Feb. 5 1944, UNIVAC capable of storing and running a program from memory