Generation of Computers

First Generation

The period of first generation: 1946-1959. Vacuum tube based.

Second Generation

The period of second generation: 1959-1965. Transistor based.

Third Generation The period of third generation: 1965-1971. Integrated Circuit based.

Fourth Generation

The period of fourth generation: 1971-1980. VLSI microprocessor based.

Fifth Generation The period of fifth generation: 1980-onward. ULSI microprocessor based