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COMPUTER GENERATIONS
After these early calculating machines, the modern computers took shape in five generations.
First Generation (1940s)
Many computers were part of the first generation computers.
MARK-I (The First Electro-Mechanical Powered Computer)
In 1944, Prof. Howard Aiken built the first electro-mechanical computer named Mark-I. It
used punched cards and a typewriter for input and output. Mark-I was much more reliable
than early electronic computers.
Mark-I
ENIAC—The First Electronic Computer
Electronic Numerical Integrator And Computer (ENIAC), was the first electronic general-
purpose digital computer built in 1946 by John Mauchly and Presper Eckert. It contained over
18,000 vacuum tubes and was 1000 times faster than Mark-I. ENIAC consumed almost 200 kW
of power.
ENIAC
10 Premium Edition-V

