Block Diagram of Computer System


Block Diagram of Computer System
Block Diagram of Computer System

Block Diagram of Computer System

The Computers can process a huge amount of data and produce accurate output within a fraction of seconds. Computer System contains four main units as shown in the below figure. The figure block diagram of computer system consists of input unit, central processing unit, storage unit, and output unit. 

Block Diagram of Computer System, components of computer, computer block diagram
Block Diagram of Computer System

As shown in the figure, these are the four major units of the computer system.

  1. Input Unit
  2. Central Processing Unit (CPU)
  3. Storage Unit
  4. Output Unit

 Let us discuss each of them in detail.

  • Input Unit

The user interacts with the computer using input units. The data is accepted from the user via input unit and this data is converted into a format which computer can understand because, the data which we enter is not understandable by a computer, the computer can understand only machine data. Data can be image, text, video, audio, character, etc. commonly used input devices to provide input to computer are mouse, keyboard, scanner, joystick, microphone, trackball, etc.

  • Central Processing Unit (CPU)

Central Processing Unit (CPU) is the brain of the computer system. The job of CPU is to control and administer the operations of the computer and it also processes the input data. As shown in the figure above Central Processing Unit (CPU) consist of control unit (CU) and arithmetic logical unit (ALU). CPU also contains a set of registers which are used to store the temporary data, the address of instructions and to store transitional results of calculations.
Central Processing Unit, Block Diagram of Computer,
Central Processing Unit

1. Arithmetic Logic Unit (ALU)

The job of Arithmetic Logic Unit (ALU) is to perform operations related to arithmetic and logical, based on the input data provided.

2. Control Unit (CU)

Control Unit controls and co-ordinates the functioning of each and every unit of the computer. Also controls all the operations of the computer. Control Unit checks the sequence of execute of programs and instructions.

3. Registers

Registers are a storage device which is used to store temporary information or data. Registers are high-speed memory units but they don’t have a huge capacity to store the data. Central processing unit uses registers directly during the execution of programs or instructions. Registers used to instructions, addresses, and temporary data.

  • Storage Unit

Storage Unit is used to store the data or information. Usually, there are two types of memory in computer, they are the primary memory and secondary memory.

The primary memory is also known as a main memory of the computer. While processing of data main memory is used to store the data, instructions, and output temporarily. The data which is to be processed is fetched into the main memory before processing and also stores instructions and intermediate results in main memory. After execution of the instructions is completed the output obtained is stored in main memory before actually displaying the result.

Also see: what is memory and different types of memory

The secondary memory is the permanent memory which stores the data permanently. The size of secondary memory is larger compared with primary memory and the speed of the secondary memory is lower compared to primary memory. Secondary memory is also known as external memory. Example are flash drives, magnetic disk, optical disk and magnetic tapes.

  • Output Unit

Output Unit delivers or displays the result. After finishing the execution of the instruction or program the generated output is delivered to output units. The output may be in text, picture, audio or video, etc. here are some of the examples of output devices, monitor which display output, printer, speaker, etc.

thus these are some of the important units in "block diagram of computer system"

Also read: what is motherboard?

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