Explanation of Block Diagram of Computer|Computer Notes



  • Data can Read/Write randomly.
  • RAM is used for storage of active programs and data.
  • It is a temporary memory.
  • It is also called Volatile memory (it will lose all stored data if power is turned off).
  • It increases the processing speed of a computer.
  • RAM is available in different sizes.
  • Also known as Primary memory.

ROM (Read Only Memory):

  • It is a permanent memory.
  • Data can only Read.
  • It is also called Non-Volatile memory (it will not lose stored data if power is turned off).
  • Instructions are stored on it during manufacturing.
  • Types are
  1. PROM (Programmable Read Only Memory)
  2.  EPROM (Erasable Programmable Read Only Memory)

Input Unit:

  • Input unit is used to communicate with computer.
  • Input unit is used to feed Instructions/Commands in computer.
  • These devices are often called as “Peripherals”, because they are separated physically from CPU.
  • Input data Reads data from user, Converts it to machine code (0 or 1) and then Store it into main memory.
  • Some common input devices are Mouse
  1. Keyboard Joystick
  2. Microphone
  3. Scanner (etc).

Output Unit:

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