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Harvard Mark I
The Harvard Mark I also known as the IBM ASCC, the Automatic Sequence
Controlled Calculator was long thought to be the first large scale automatic
digital computer, until after World War II the Z3 by Konrad Zuse was
The Mark I was devised by Howard H. Aiken, created at IBM, shipped to
Harvard in February 1944 and formally delivered there on August 7, 1944.
The building elements of the Mark I were switches, relays, rotating shafts,
and clutches. It was built using more than 750,000 components, amounting to
a size of 50 feet in length, 8 feet in height and a weight of about 5 tons.
The most famous operator / programmer of the Harvard Mark I was Grace
Other universities have their "Mark I" computers as well, but the Harvard
Mark I is generally described as "the" Mark I.