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The first digital computer was built in 1946 at the University of Pensylvania. It weighed 30 tons and filed a large room. In its early days it required 18,500 vacuum tubes to store information. Obviously, a 30-ton computer had its liminations. Scientists and engineers worked to make it better. The use of transistors as small amplifiers in place of the large vacuum tubes reduced and cost of computers.
Smaller was better. In the early 1960's, the first microcomputer were made commercially. They were the size of a two-drawer file cabinet. The revolution was on. Less than a decade later, the microcomputer was invented. The basic unit of the microcomputer is a tiny silicon chip less than 1 cm on a side. Each chip is a miniature electronic circuit that serves the different computer functions. Amazingly, each circuit contains thousands of elements. The great advances on microelectronics have helped to achieve the moon landing, satellites, digital watches, computer games, and even computer-controlled automobile engines.