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Unformatted text preview: e much higher
performance and cost less. Thus, a recently introduced small system can
outperform the large models of a few years ago, and a new minicomputer can do
the work of an earlier mainframe at a much lower cost. Hence today computers are
classified based on their mode of use. According to this classification scheme
computers are classified as notebook computers, personal computers,
workstations, mainframe systems, supercomputers, and clients and servers. In this
chapter you will learn about these types of computers.
Notebook computers are portable computers which are mainly meant for use by
people who need computing power wherever they go. As their name implies,
notebook computers are approximately of the size of an 8½ x 11 inch notebook
and can easily fit inside a briefcase. Since they have to be carried along, they are
also light in weight, weighing around 2 Kg. They are also known as laptop PCs
(laptop personal computers) because they are as powerful as a PC and their size
and weight allows them to be used by comfortably placing them on ones lap.
As shown in Figure 20.1, a notebook computer uses an almost full-size keyboard,
a small flat screen liquid crystal color display, and a trackball (instead of a mouse
because notebook computers are often used without a desk). They also have a hard
disk (of few hundred mega bytes), a floppy disk drive, and sometimes a CD-ROM
drive also. The display screen is foldable in such a way that when riot in use, it can
be folded to flush with the keyboard to convert the system into notebook form.
When in use, the display screen is folded open as shown in the figure. Many
models of notebook computers can be plugged into a "dock" on a docking station
(a personal computer or a workstation) to take advantage of the larger machine's
big monitor, storage space, and other peripherals such as a printer. Many models
of notebook computers can also be connected to a network so that they can
download data (read files) from...
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This document was uploaded on 04/07/2014.
- Spring '14