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SECOND GENERATION

Timeline: 1950s
Technology: Transistors
Example of Computer: UNIVAC III, IBM 1401, IBM
700 and Honeywell 200, etc.
Features:
More efficient and economical
Smaller in size compared to first-generation computers
Could calculate data in seconds

THIRD GENERATION

Timeline: 1960s

Technology: Integrated Circuits or ICs (An IC is also called
a chip, and it houses a large number of transistors in it.)
Example of Computer: IBM 360, Apple 1, UNIVAC 1108,
and UNIVAC AC 9000
Features:

Faster and more economical than second-generation computers
Highly reliable
The keyboard and the mouse were used for input purposes

Used an operating system, thereby allowing many applications to run at one
time

FOURTH GENERATION

Timeline: 1970s
Technology: Microprocessor (A Microprocessor is the
entire CPU on a single chip. It is a VLSI circuit. VLSI

stands for Very Large-scale Intergration).
Example of Computer: Desktop, HP 9000, IMP PC,
Apple Macintosh

Features:
Reduction in the size of computer
More reliable than the earlier generation of computers with a great storage
device

Extremely powerful and can process millions of instructions per second

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