Explanation of Block Diagram of Computer|Computer Notes



BLOCK DIAGRAM OF A COMPUTERCOMPUTER ARCHITECTURE

BLOCK DIAGRAM OF A COMPUTER:

Computer contains five basic units

1)     Memory Unit
2)     Arithmetic Logic Unit (ALU)
3)      Input Unit
4)     Output Unit
5)     Control Unit (CU)

  1. CENTRAL PROCESSING UNIT (CPU):
  • CPU is the brain of a computer.
  • Transform raw data into useful information.
  • CPU is responsible for all Processing.
  • It has two parts

Arithmetic Logic Unit (ALU) Control Unit (CU)

Arithmetic Logic Unit (ALU):

  • It is the part where actual processing takes place.
  • It can perform Addition, Subtraction, Multiplication, Division, Square Roots (etc) and logic operations such as AND, OR (etc) on binary numbers.

Control Unit (CU):

  • It tells the computer that, “What specific sequence of operations it must perform”.
  • It also specifies timing of the instructions.
  • Its function is to Fetch, Decode and Execute instructions that are stored in memory.
  • It controls

Memory Devices

  • Arithmetic Logic Unit
  • All Input/Output Devices

Main Memory:

  • Also called Primary memory or Internal memory.
  • Memory is used to store data temporary or permanently.
  • Data stored in memory can be used for required task.
  • RAM and ROM are most commonly used as main memory.

RAM (Random Access Memory):

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