As the name implies pcs were mainly designed to meet

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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 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.

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