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Processing Device
A computer converts the input into meaningful information
through the processing device. The CPU (Central Processing
Unit) is the processor. It is known as the brain of a computer
that does all the calculations, runs all the programs and
manages all the operations. The CPU is a chip that is placed
CPU CPU box
inside the CPU box.
The working of a CPU can be shown with the help of the following block diagram:
INPUT Unit ALU OUTPUT Unit
Control Unit
Memory Unit
CPU
Arithmetic Logic Unit (ALU)
The ALU does arithmetic calculations like addition, subtraction, multiplication,
division and so on. It also does logical comparisons like greater than, less than,
equal to and so on.
Control Unit (CU)
The CU coordinates between all the parts of the CPU. The CU gets data and
instructions from the memory unit and passes them to ALU in a step-by-step
manner.
Memory Unit (MU)
The MU stores data and instructions given to the computer and the result of the
processing.
Output Devices
A computer displays the results of the processed data through the output devices.
Some of the output devices are monitor, printer, speakers, etc.
A Computer System 9

