ENIAC, the first computer was a giant by John W. Mauchly and J. Presper Eckert at the University of Pennsylvania 10 ENIAC using decimal rather than binary, who like the previous auto calculator/computer, ENIAC, the first computer to use more than 2000 vacuum tube uses almost 18000 vacuum tube. 167 m2 (1800 square feet) of space will be filled out a card punch and arithmetically with the factor 1, Rooter square 1 and split the decimal adders using counter ring, 20 "functioning as adders and storing quick access read, write register (0.0002 seconds)