2
Overview of Computer
This chapter presents a broad introduction about computers. After completion of this chapter,
the reader would know about
R Basic structure of computer hardware with its fundamental units
R General operational concepts of a computer
R Bus structure
R A few important modules inside a computer.
C HAPTER OBJECTIVE
2.1 BASIC STRUCTURE OF COMPUTER HARDWARE
The external appearance of modern PCs is simple, attractive and well-known to all of us. It must have
a keyboard for instruction input—sometimes a mouse for quicker actions. The display unit is the most
prominent one, where we generally look for the output. In some cases, there may be a printer attached
with it, resting quietly at one corner. If it is not a laptop, then we can expect to nd a separate chassis,
housing the system, the source and destination of most of the interconnecting cables.
Because of BlueTooth and other Wi-Fi facilities, the number of these interconnecting cables
is decreasing nowadays. Wi-Fi is already available for internet connection and BlueTooth for
the mouse. In the near future, all other essential peripheral devices would also be interfaced
through wireless communications, eliminating the need of these interconnecting cables, for
which the chassis had been famous so far.
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