Generation of Computer Easy

Generation of Computer:
                        Generation" in computer talk in a new step in hardware or software technology. Different generations of computer are as follows:

1st Generation (1942-1955) Vacuum Tube:
Vacuum tubes (fragile glass device) were the only  electronic component available during those day that possible to make electroinc digital computer.
These computers can calculate data in millisecond; these were very large in size.
Examples: UNIAC, EDVAC, EDSAC

 
2nd Generation (1956-1964) Transistor:
The transistor (Solid State Device) a smaller and more reliable successor to the vacuum tube was invented in 1947.
Faster in speed from the previous computers. These computers were able to reduce computational time from milliseconds to microseconds.
Examples: UNIVAC III, SS80, SS90, 1107.

 

3rd Generation (1964-1975) Integrated Circuits:
Advance "Microelectronic"  technologhy made it possible to integrate larger number of circuit elements into very small (less than 5 mm square) surface of silicon know as Chip or Integrated Circuit (IC). The use of IC in place of transistors gave birth of new generation, they were able to reduce computational time from microsecconds to nanoseconds.
Examples: IBM System/360 Series

 
4th Generation (1975-Present) VLSI:
Small Scale Integration (SSI) contains ten to twenty ICs components. Medium Scale Integration (MSI), which has hundreds of integrated components in a single chip. Large Scale Integration (LSI) possible to integrate 30,000 components into a single chip. Very Large Scale Integration (VLSI) contains one million components integrated on a single chip.