Draw a block diagram of a computer system. Explain its functional components.

A typical block diagram of a computer system includes: Input Unit: Takes input from input devices. Processing Unit: Consists of Control Unit (CU) and Arithmetic Logic Unit (ALU). Storage Unit: Stores data and instructions. Output Unit: Sends processed data to output devices. The flow is generally: Input Unit -> (Control Unit & Storage Unit) -> ALU -> (Control Unit & Storage Unit) -> Output Unit. Functional Components of Computer System: i) Input Devices: The set of instruction or information is provided to the computer with the help of input devices such as (keyboard, mouse, scanners etc.). The Instruction or data presented to computer system is converted into binary form then it is supplied to computer system for further processing. ii) Output devices: Produce outputs on - such as printer, monitor etc. With the help of output devices, the system is connected with outside world. iii) Storage: The process of saving data and instructions permanently is known as storage. Data has to be fed into the system before the actual processing starts. It is because the processing speed of Central Processing Unit (CPU) is so fast that the data has to be provided to CPU with the same speed. Therefore, the data is first stored in the storage unit for faster access and processing. This storage unit or the primary storage of the computer system is designed to do the above functionality. It provides space for storing data and instructions. iv) Central Processing Unit (CPU): The CPU is an electronic hardware device which performs all the operation such as arithmetic and logic operation. The CPU is another term for "PROCESSOR". Every instruction given through the input devices such as keyboard or mouse is carried further for processing and we user get our desired results through are output devices such as printers and monitors. v) Control Unit (CU): CU coordinates all activities performed in a computer system. It receives information or instruction or directions from the main computer. It tells the logic unit, memory as well as the input and output devices how to handle the program or instruction in proper order. vi) Arithmetic and Logic Unit: There are some processors now that has more than single AU (Arithmetic Unit). ALU performs arithmetic and logical operation. When a set of instruction or program is conveyed out. Control unit generally characterized which sort of operation to Execute. Arithmetic operation comprises of (Addition, subtraction, division, multiplication) and the logical unit carries out the operation such (AND, OR, Equal, less than, greater then), and later the control is changed to ALU and the result generated in ALU later stored or puts away in transitory memory.