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Transcript

  • 1.
    • COMPUTER AND BASIC
    • APPLICATION
    • PRESENTED BY:
    • PURTI SHARMA
  • 2. INDEX
    • An introduction to computer
    • Characteristics of computer
    • Generations of computer
    • Basic computer organization
  • 3. Introduction
    • The word computer comes from the word “ compute ” which means to calculate, so a computer is normally considered to be a computing device.
    • More accurately , a computer may be defined as a device that operates upon information or data.
    • So we can say that a computer is a device that accepts input, process it and convert it into output.
  • 4. Characteristics of computer
    • Accuracy
    • Diligence
    • Versatility
    • Power of remembering
    • No i.q
    • No feelings
    • speed
  • 5. GENERATIONS OF COMPUTER
    • First generation(1942-1955)- these machines and other of their time were made possible by the invention of “vacuum tube” , which was a fragile glass device that could control and amplify electronic signals.
  • 6.
    • Second generation(1955-1964)-
    • the transistor , a smaller and more
    • reliable successor to the vacuum tube
    • was invented in 1947.
    • However computers that used transistor
    • were not produced in quantity until over
    • a decade later.
    • These were smaller in size and generates less
    • heat.
    • Speed was also faster than firs generation
    • computers.
  • 7.
    • Third generation(1964-1975)-
    • Advances in electronic technology continued and the advent of “microelectronics” technology made it possible to integrate large numbers of circuit elements into very small (less than 5 mm square) surface of silicon known as chips.
  • 8.
    • Fourth generation(1975 onwards)- Initially the integrated circuits contained only about ten to twenty components.
    • This technology was named small scale integration (ssi). Later with the advancement in technology for manufacturing ic , it became possible
    • to integrate upto a hundred components on a single chip. This came to be known as medium scale integration. Then came the era of large scale integration when it was possible to integrate over 30,000 components onto a single chip.
  • 9. BASIC COMPUTER ORGANIZATION
    • INPUT UNIT— Data and instructions must enter the computer system before any computations can be performed on the supplied data. This task is performed by the input unit that
    • links the external environment with
    • computer system.
  • 10.
    • Output unit – The job of an output unit is just the reverse of that of input unit.
    • It supplies the information and results to
    • the outside world.
    • Arithmetic and logic unit- The arithmetic
    • logic unit is the place where the actual
    • execution of the instructions take
    • place during the processing
    • Operation .To be more precise all
    • calculations are performed and
    • decisions are made in the ALU.
  • 11.
    • Control unit – By selecting , interpreting and seeing to the execution of program instructions , the control unit is able to maintain , order and direct the operation of the entire system.
    • Central processing unit – The control unit and ALU of a computer system are jointly known as central processing unit. The c.p.u is the brain of any system.
  • 12. i/p unit Storage unit o/p unit Control unit ALU Results Central processing unit data