Univac II computer built in 1955.  The section pictured is only part of the Univac II; additional parts included a walk-in processor and over 7,000 vacuum tubes. Parts of the Univac I, built in Saint Paul, Minnesota in the 1940s, were recycled for this subsequent model. In 1955, it was the only computer that could read, write, and compute simultaneously without the help of extra equipment.