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• Fourth Generation – Microprocessors

  From 1972 until now

  - Used large scale to very large scale integrated circuits

  - Put more than one IC on silicon chip

  - Can do more than one unction

  - Smaller, faster, more reliable, and lower in price

  - Size of a television or much smaller

  - Can do 500,000 to 1,000,000,000 operations/second

  - Cost one-tenth, or less, the amount of third generation

  -Very common in homes and business
• TYPES OF COMPUTER

  Analog Computers

  - Recognizes data as a continuous measurement of a physical property

  - It has no state

  - Its output is usually displayed on a meter or graphs

  Examples

  - Analog clock

  - Speedo-meter of a car

  - Thermometer
• Digital computers. - it works with numbers

  - they breaks all types of information into tiny units and use numbers to represent those pieces of information

  - everything is described in two states i.e. either ON(1) or OFF (o)

  -They are very fast and have big memory
• Supercomputer

  • Is a computer with a high-level computational capacity compared to a general-purpose computer
  • It comprised of multiple high performance computers working in parallel as a single system
  • Uses thousands of processor at a same time
  • Used for : Nuclear weapon
  • Weather forecasting
  • Scientific simulation
  • Oil and gas exploration
  • Large companies
• Mainframe

  • Huge computers that could fill an entire room or even a whole floor
  • Can run multiple instances of operating systems at the same time
  • Used primarily by large organizations for critical applications, bulk data processing
  • It uses for online data storage
  • Used for transaction processing in banking, airlines, etc.