http://www.youtube.com/watch?v=3r2xWVCn97A
Thursday 3 April 2014
what is Laptop computer ?
A small, portable computer -- small enough that
it can sit on your lap. Nowadays, laptop computers are more frequently called
notebook computers.
what is Workstation?
It is a type of computer used for engineering applications
(CAD/CAM), desktop publishing, software development, and other types of
applications that require a moderate amount of computing power and relatively
high quality graphics capabilities. Workstations generally come with a large,
high-resolution graphics screen, at large amount of RAM, built-in network
support, and a graphical user interface. Most workstations also have a mass
storage device such as a disk drive, but a special type of workstation, called
a diskless workstation, comes without a disk drive. The most common operating
systems for workstations are UNIX and Windows NT. Like personal computers, most
workstations are single-user computers. However, workstations are typically
linked together to form a local-area network, although they can also be used as
stand-alone systems.
what is Minicomputer?
It is a midsize computer. In the past decade, the distinction between large minicomputers and small mainframes has blurred, however, as has the distinction between small minicomputers and workstations. But in general, a minicomputer is a multiprocessing system capable of supporting from up to 200 users simultaneously
Wednesday 2 April 2014
Personal computer
It can be defined as a small, relatively
inexpensive computer designed for an individual user. In price, personal
computers range anywhere from a few hundred pounds to over five thousand
pounds. All are based on the microprocessor technology that enables
manufacturers to put an entire CPU on one chip. Businesses use personal
computers for word processing, accounting, desktop publishing, and for running
spreadsheet and database management applications. At home, the most popular use
for personal computers is for playing games and recently for surfing the
Internet.
Personal computers first appeared in the late
1970s. One of the first and most popular personal computers was the Apple II,
introduced in 1977 by Apple Computer. During the late 1970s and early 1980s,
new models and competing operating systems seemed to appear daily. Then, in
1981, IBM entered the fray with its first personal computer, known as the IBM
PC. The IBM PC quickly became the personal computer of choice, and most other
personal computer manufacturers fell by the wayside. P.C. is short for personal
computer or IBM PC. One of the few companies to survive IBM's onslaught was
Apple Computer, which remains a major player in the personal computer
marketplace. Other companies adjusted to IBM's dominance by building IBM
clones, computers that were internally almost the same as the IBM PC, but that
cost less. Because IBM clones used the same microprocessors as IBM PCs, they
were capable of running the same software. Over the years, IBM has lost much of
its influence in directing the evolution of PCs. Therefore after the release of
the first PC by IBM the term PC increasingly came to mean IBM or IBM-compatible
personal computers, to the exclusion of other types of personal computers, such
as Macintoshes. In recent years, the term PC has become more and more difficult
to pin down. In general, though, it applies to any personal computer based on
an Intel microprocessor, or on an Intel-compatible microprocessor. For nearly
every other component, including the operating system, there are several
options, all of which fall under the rubric of PC
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