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Computer Generations

Computer GenerationsMd. RaseduzzamanMd. Monirll AwalGolam MostofaRifat Hasan HridoyFoysal Ahmed

Introduction Md. Raseduzzaman

Generationincomputer terminology is a change in technology acomputeris/was being used. Initially, thegenerationterm was used to distinguish between varying hardware technologies.

What is computer generation?

Generation of Computer

Frist Generation ComputersUNIVAC,EDVAC,EDSACandENIACcomputers are examples of firstgenerationcomputing devices.CHARACTERISTICS:1) Firstgenerationcomputers were based on vacuum tubes.2) The operating systems of the firstgenerationcomputers were very slow.3) They were very large in size.4) Production of the heat was in large amount in firstgenerationcomputers.5) Machine language was used for programming.6) Firstgenerationcomputers were unreliable.7) They were difficult toprogramand use.

Ipmortant parts

The Vacuum Tube(1942-1954)

Md: Foysal Ahmed ID : 161-15-7492Second Generation Computers

Second Geeneration of Computer (1955-1964)

Important part

A vacuum tube

IC chip

Third Generation ComputersMd. Monirll Awal

Third Generation Computers


Third Generation ComputersEmployed during the period 1964-1975. Integrated circuit (ICs) began to be used. These ICs were called chips.Some of the computers developed during this period were:IBM-360- developed by IBM in 1964.PDP-8 -developed by DEC in 1965.PDP-11 -developed by DEC in 1970.VAX- developed by DEC in 1978.

AdvantagesFastest computing devices. Very productive. Easily transportable from one place to another because of their small size.Use high-level languages. Could be installed very easily and required less space.

Fourth Generation ComputersMd. Refat Hassan Hredoy

Fourth Generation Computers


Computer-Fourth GenerationThe period of fourth generation was 1971-1989. The computers of fourth generation used Very Large Scale Integrated (VLSI) circuits. VLSI circuits having about 5000 transistors and other circuit elements and their associated circuits on a single chip made it possible to have microcomputers of fourth generation. Fourth generation computers became more powerful, compact, reliable, and affordable. As a result, it gave rise to personal computer (PC) revolution.

The main features of fourth generation are:-VLSI technology usedVery cheapPortable and reliableUse of PC'sVery small sizePipeline processingNo A.C. neededConcept of internet was introducedGreat developments in the fields of networksComputers became easily available

Advantages of Fourth GenerationSmaller in size and much reliable.No cooling system required in many cases.Much faster computation.Portable and cheap.The heat generated was negligible.Totally general purpose computer.

Disadvantages of Fourth Generation

Latest technology was required for manufacturing of microprocessors.

Some computers of this generation were:1. DEC 102. STAR 10003. PDP 114. CRAY-1(Super Computer)5. CRAY-X-MP(Super Computer)

Fifth Generation ComputersGolam Mostofa Imran

Fifth generation computers

(1989 - present)

ICs with ULSI technologyLarger capacity main memory hard disks with RAID supportOptical disks as portable read-only storage mediaNotebooks powerful desktop PCs and workstationsPowerful servers supercomputersInternetCluster computingKey hardware technologies

Micro-kernel based multithreading distributed OSParallel programming libraries like MPI & PVMJAVAWorld Wide WebMultimedia Internet applicationsMore complex supercomputing applicationsKey software technologies

Portable computersPowerful, cheaper reliable, and easier to use desktop machinesPowerful supercomputersHigh uptime due to hot-pluggable componentsTotally general purpose machinesEasier to produce commercially easier to upgradeRapid software development possibleKey characteristics

1. IBM notebooks2. Pentium PCs3. SUN4. Workstations5. IBM SP/26. SGI Origin 20007. PARAM 10000

Some rep systems

Thank you