Mark 1 (1944)
Conceived by Howard H. Aiken of Harvard University in 1937, the first automatic digital computer
was built by International Business Machines in 1944. An automatic sequence controlled calculator, it
was first used for computing ballistic data. The computer could do three additions per second, working
as fast as 20 people on calculators. The Mark 1 took up a lot of space; it was 51 ft. long and 8 ft. high,
with 750,000 parts.