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Generations of computers.15
 

Generations of computers.15

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    Generations of computers.15 Generations of computers.15 Presentation Transcript

    • Generations of computers. http://improvec.blogspot.in/ 1
    • Objective:On completion of this period, you would beable to know: The generations of computers. http://improvec.blogspot.in/ 2
    • Generations of computers The first generation computers The second generation computers The third generation computers The fourth generation computers The fifth generation computers http://improvec.blogspot.in/ 3
    • The First Generation Computers. The digital computer using electronic device (vacuum tubes) is known as the first generation computer. The first generation computer used vacuum tube as a CPU component. http://improvec.blogspot.in/ 4
    • The first generation computers (contd): Vacuum Tube is the main technology Acoustic delay lines were used for memory These are costly but slower devices Larger in size Produced more heat Maintenance was needed Highly unreliable. http://improvec.blogspot.in/ 5
    • The first generation computers (contd): They used fixed-point arithmetic Examples : IBM 700 series – IBM 701, IBM 704, IBM 709, EDVAC and UNIVAC. http://improvec.blogspot.in/ 6
    • The second generation computers The second generation computers used transistors as CPU components Ferrite cores for main memory and magnetic disks and tapes for secondary memory. http://improvec.blogspot.in/ 7
    • The third generation computers The third generation computers used ICs (SSI and MSI) as CPU components. These used magnetic core memory, but later on semiconductor memories. http://improvec.blogspot.in/ 8
    • The third generation computers (contd) Semiconductor memories were LSI chips. Concept of Cache memory was introduced. http://improvec.blogspot.in/ 9
    • The third generation computers (contd) Micro programming, parallel processing, multi processing, multi user system and time sharing system etc were introduced. Examples:IBM/370 series (1970),CDC 7600 (1969), CDC’s CYBER-175 and STAR-100,etc http://improvec.blogspot.in/ 10
    • The fourth generation computers Fourth generation computers use VLSI chips for CPU, memory and supporting chips. They use microprocessor as CPU (32 bit or 64 bit). http://improvec.blogspot.in/ 11
    • The fourth generation computers (contd) They also contain many other essential components such as FPU (Floating Point Unit), MMU (Memory Management Unit), first level and second level cache memory etc. Examples of latest microprocessors :Pentium II and Pentium III, Power PC ,DEC’s Alpha, SUN’s ULTRASPARC ,AMD’s K-6,K-7,etc http://improvec.blogspot.in/ 12
    • The fifth generation computers (contd) : The fifth generation computers are under development stage. These computers will use ULSI (ultra large scale integration) chips. http://improvec.blogspot.in/ 13
    • The fifth generation computers (contd) : ULSI chips contain millions of components into a single IC. The input and output information for these computers will be in the form of speech and graphic images http://improvec.blogspot.in/ 14
    • The fifth generation computers (contd) : The computer will understand natural languages like English , Japanese , etc. The programmers will not have to learn programming languages. http://improvec.blogspot.in/ 15
    • The fifth generation computers (contd) : They will be able to speak commands or key information in their mother tongue Vision system will also be incorporated. http://improvec.blogspot.in/ 16
    • GENERATIONS OF COMPUTERSGenerations Components Advantages Disadvantages Examples usedFirst (1946- Vacuum tubes Machine Language Costlier, more IBM700,ENIAC,1954) space, excess EDVAC powerSecond(1955- Transistors Less expensive, less Used Assembly IBM7090,1964) power, Language IBM7094 I, Cheaper & small in IBM9094 II sizeThird(1965- Integrated circuits, Smaller, Faster, IBM/370 series,1974) Semi conductor Cheaper - Cyber175 memoryFourth(1975- VLSI chips Faster, Less power Uses one or more CRAY Y_MPC,1984) consumption microprocessors WIPRO LANDMARK 860Fifth(1985- ULSI Very high - Windows 2000,present) performance, Easy Xp, Linux access, Multiprocessing http://improvec.blogspot.in/ 17
    • SummaryIn this class, we have learnt about Generations of computers http://improvec.blogspot.in/ 18
    • Frequently Asked Questions Explain different generations of computers? http://improvec.blogspot.in/ 19
    • Quiz1. The third generation computers used a. vacuum tubes b. transistors c. ICs d. LSIAnswer: c http://improvec.blogspot.in/ 20
    • Quiz2. The second generation computers used a. vacuum tubes b. transistors c. ICs d. LSIAnswer: b http://improvec.blogspot.in/ 21
    • Quiz3. The first generation computers used a. vacuum tubes b. transistors c. ICs d. LSIAnswer: a http://improvec.blogspot.in/ 22