Sunday, April 30, 2017
Block diagram of computer
Figure:- 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)
2) Arithmetic Logic Unit (ALU)
3) Input Unit
4) Output Unit
5) Control Unit (CU)
- 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
2. 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.
3. 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
4. Memory Devices
- Arithmetic Logic Unit
- All Input/Output Devices
5. 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
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