Definition of Computer
Computer: The word computer is taken from the Latin word “compute” which means “calculate”.
According to the Oxford English Dictionary, the word “computer” was first used to describe a mechanical calculating device in 1897.
A computer is an electronic and programmable device used to solve a lot of problems in our daily life. It is used to store and process data to make a decision.
Generation of Computer
Historical Evolution of Computers
Father of modern computers – Charles Babbage (British mathematician)
Invented computers (mechanical): Analytical Engine, Difference Engine.
Generation of Computer: The gradual development of present computers over past computers are divided into different time periods. Each time period is considered as a generation of computer.
The parameters which are used to measure the development of present computers over past computers are:
Space: Space must be minimized.
Speed: Speed must be maximized.
Capacity: Capacity must be maximized.
Cost: Cost must be minimized.
Different Generation of Computers and Their Used Technologies
|First Generation Computers||1942–1955||Vacuum Tube|
|Second Generation Computers||1956–1965||Discrete Transistors|
|Third Generation Computers||1966–1975||Integrated Circuits (ICs)-SSI|
|Fourth Generation Computers||1976–1985||MSI , LSI|
|Fifth Generation Computers||1986–onwoards||VLSI, VVLSI (ULSI)|
|Full meaning||No. of Discrete Transistors (Approximately)|
|SSI||Small Scale Integration||1000|
|MSI||Medium Scale Integration||10,000|
|LSI||Large Scale Integration||100000|
|VLSI||Very Large Scale Integration||10,00000|
|VVLSI||Very Very Large Scale Integration||10000000|
|ULSI||Ultra Large Scale Integration||10000000|