Page 12 - TP_iPlus_V2.1_Class5
P. 12
i + COMPUTER GENERATIONS
After these early calculating machines, the present computer took its shape in five
generations.
First Generation (1940s)
There were many computers that were a 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
The Electronic Numerical Integrator And Computer 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
iPlus (Ver. 2.1)-V

