Generation of Computer 

First Generation of Computer (1940-1956)

• The first computers used vacuum tubes for circuitry and magnetic drums.
• Punch card & Paper tape was secondary storage.
• limited internal storage capacity & slow input/output operations. 
• It is not portable.
• Consume lot of electricity.
• The UNIVAC and ENIAC computers are examples of  Ist generation computing device.
• Some Computer of this generation were: ENIAC, EDVAC, UNIVAC, IBM-701, IBM-650

Second Generation of Computer(1956-1963)

• The Second Generation computer replacement of vacuum tubes by transistors. 
• Tapes and magnetic disk was used for Secondary Storage.
• High-level procedural languages  COBOL & FORTRAN.
• Smaller, Faster, cheaper and less heavy on electricity use than first generation Computer.
• Magnetic core was use for primary storage.
• Some Computer  of this generation: IBM1620, IBM7094, CDC1604, CDC3600, UNIVAC1108.

Third Generation (1964-1971)

• The Third Generation of computer used Integrated Circuits(ICs) in place of transistors.
• IC was invented by Jack Kilby.
• A Single IC has many transistors, resistors, and capacitors.
• Magnetic-disk was used for secondary storage.
• Smaller than Second generation.
•  In this Generation Operating system wad developed.
• Development of mini Computer 
•  Some Computer of this gen.: IBM-360 Series, Honeywell-6000 series, PDP(Personal Data Processor), IBM-370/168, TDC-316

Forth Generation (1972-2010)

• Used Microprocessors.
• Semi-Conductor were used for Primary Storage.
• Development of microcomputer or PC.
• Large Scale integrated Circuits & very large scale integrated was used in this generation.
• High level languages like C, C++ & DBMS used in the generation.
• The forth generations Computer are  DEC10, STAR 1000, PDP 11, CRAY-1 CRAY-X-MP(Super Computer.

Fifth Generation (Present and Beyond) 

• 5th gen. Computer devices, based on artificial intelligence.
• Ultra Large Scale Integration(ULSI) used in this Generation.
•  Ram & Rom is used for primary Storage.
• HDD & SSD is used for Secondary Storage.
• All higher level programming languages like C, C++, JAVA, PYTHON, .NET are used in this Generation.
• The Fifth Generations Computer are Desktop, Laptop, NoteBook, UltraBook, ChromeBook.