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Unformatted text preview: it and the arithmetic logic unit of a computer system are jointly known as
the Central Processing Unit (CPU). The CPU is the brain of any computer system. In a
human body, all major decisions are taken by the brain and the other parts of the body
function as directed by the brain. Similarly, in a computer system, all major calculations
and comparisons are made inside the CPU and the CPU is also responsible for activating
and controlling the operations of other units of a computer system.
THE SYSTEM CONCEPT
You might have observed by now that we have been referring to a computer as a system
(computer system). What can be the reason behind this? To know the answer let us first
consider the definition of a system.
A system is a group of integrated parts that have the common purpose of achieving some
objective(s). So, the following three characteristics ape key tea system:
1. A system has more than one element.
2. All the elements of a system are logically related.
3. All the elements of a system are controlled in such a way that the system goal is
Since a computer is made up of integrated components (input, output, storage, and CPU)
that work together to perform the steps called for in the program being executed, it is a
system. The input or output units cannot function until they receive signals from the
CPU. Similarly, the storage unit or the CPU alone is of no use. So the usefulness of each
unit depends on other units and can be realized only when all units are put together
(integrated) to form a system.
Points to Remember
1. All computer systems perform the following five basic operations for converting raw
input data into useful information - inputting, storing, processing, outputting, and
2. The main components of any computer system are shown in Figure 2.1.
3. The input unit allows data and instructions to be fed to the computer system from the
outside world in computer acceptable form.
4. The input interfaces transform the input data and ins...
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- Spring '14