In 1944, the first American program-controlled computer was developed by Howard Hathaway Aiken. The "Automatic Sequence Controlled Calculator (ASCC) Mark I," as it was called, was patterned after Charles Babbage's designs for the analytical engine of a hundred years before. Punched paper tape carried the instructions and telephone relays controlled number wheel registers. The Mark I measured fifty feet long and eight feet tall, with almost five hundred miles of wiring, and was used at Harvard University for 15 years.
