Electro-Machanical Computer

Mark-I


* Designed by Howard Aiken (1900-1973), a Harvard Engineer in 1937.
* It was the first automatic electromechanical computer.
* It was 51 ft. long, 8 ft. tall and 3 ft. wide having 18000 vaccum tubes.
* It used instructions stored in paper tapes and panched cards.
* It consits of 7 lakhs 50 thousands parts.







ABC(Atnosoft-Berry Computer)


* First ecletromechanical digital computer.
* Built in 1937-1942 at Lowa State University by john V. Atanasoft and Clifford Berry.
* It Introduce the ideas of binary arithmetic and logic circut.
* It used punch cards as secondy Storage.