ENIAC I

ENIAC (Electronic Numerical Integrator and Computer) is considered tp be the first fully functioned computer. It was capable of reprogramming itself to solve different types of computing problems. ENIAC was developed in 1946 by John Mauchly and John Presper Eckert to calculate artillery firing tables for the United States Army. The ENIAC contained 17,468 vacuum tubes, covered 1800 square feet, weighted 30 tons and used 160 kilowatts of electrical power.

The vacuum tubes were used for binary on and off determinations and have now been replaced by, solid-state devices such as transistors and semiconductors.