Computers Generations are classified into 5 broad Groups
1st Generation :
In this generation Computers the following are used
Electronic element - Vaccumtubes
MainMemory - Magnetic Drums
Speed - 1/103 Seconds (Milli Second)
2nd Generation
In this generation Computers the following are used
Electronic element - Transistors
Mainmemory - Magnetic Core
Speed - 1/106 seconds (Micro Second)
3rd Generation
In this generation Computers the following are used
Electronic element - Integrated Circuits ( IC's)
Speed - 1/109 seconds ( Nano Second)
4th Generation
In this generation Computers the following are used
Electronic element - Micro Processor
Speed - 1/1012 seconds
(Pico Second)
5th Generation
These generation Computers are called Knowledge Information Processing Systems(KIPS)
These are mainly aimed on Artificial Intelligence Chips (AI).
These Computers are still under developement.