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Unit 1: Data Information
Notes
Figure 1.2: ALU
1.1.1.2 Control Unit (CU)
The next component of computer is the Control Unit, which acts like the supervisor seeing that
things are done in proper fashion. The control unit determines the sequence in which computer
programs and instructions are executed. Things like processing of programs stored in the main
memory, interpretation of the instructions and issuing of signals for other units of the computer
to execute them.
1.1.1.3 Central Processing Unit (CPU)
The ALU and the CU of a computer system are jointly known as the central processing unit.
You may call CPU as the brain of any computer system. It is just like brain that takes all major
decisions, makes all sorts of calculations and directs different parts of the computer functions by
activating and controlling the operations.
Draw a diagram which explains all functional units and their functions of a
computer system.
Figure 1.3: CPU
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