-Types of Computers

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8 Νοε 2013 (πριν από 4 χρόνια)

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Types of Computers


Types of Computers


There are many types of computers in the world today.
Broad categories exist which classify computers on the
basis of system performance. Computers have
categorised based on physical size, use, location and
cost.

Personal Computer


Other names for the Personal Computer include:


PC


Microcomputer


Desktop computer

Personal Computer


Personal computers first appeared in the late 1970s. A
small, relatively inexpensive computer designed for an
individual user. In price, personal computers range
anywhere from a few hundred dollars to thousands of
dollars. All are based on the microprocessor
technology that enables manufacturers to put an
entire CPU on one chip.

Personal Computer


Personal Computer
-

Uses


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

Laptops


laptop computer, usually called a notebook computer
by manufacturers, is a battery
-

or AC
-
powered
personal computer generally smaller than a briefcase
that can easily be transported and conveniently used
in temporary spaces such as on airplanes, in libraries,
temporary offices, and at meetings.

Laptops


A laptop typically weighs less than 5 pounds and is 3
inches or less in thickness. Among the best
-
known
makers of laptop computers are IBM, Apple, Compaq,
Dell, HP, Sony, Acer and Toshiba.


Laptops


Laptop computers generally cost more than desktop
computers with the same capabilities because they are
more difficult to design and manufacture.

Minicomputers


Minicomputers are computers that are somewhere
in between a microcomputer and a mainframe
computer. In times past, the minicomputer was
typically a stand alone device that was ideal for use
by small and mid
-
sized businesses who needed
more power and memory than could be obtained
with microcomputers, but did not have a need for
the resources provided by mainframes. More
recently, a minicomputer is thought of in terms of
being a server that is part of a larger network.

Mainframes


Mainframes

are powerful computers used mainly by
large organizations for critical applications, typically
bulk data processing such as census, industry and
consumer statistics, enterprise resource planning, and
financial transaction processing.

Mainframes


A mainframe is a high
-
performance computer used for
large
-
scale computing purposes that require greater
availability and security than a smaller
-
scale machine
can offer


They are very expensive

Mainframes


Supercomputers


A supercomputer is a computer that is among the
largest, fastest or most powerful of the computers
available


As of this writing (late 2007) the fastest
supercomputers operate on the order of more than 200
teraflops (that's computer lingo for trillions of
operations per second)

Supercomputer


They are used for:


Number crunching


Scientific simulations


Research


Industries such as space exploration, medicine and
energy industry


Supercomputer


Tablet PC


A
tablet personal computer (tablet PC)

is a
portable personal computer equipped with a
touchscreen as a primary input device designed to be
operated and owned by an individual

Tablet PC


Unlike laptops, tablet personal computers may not be
equipped with a keyboard, in which case they use a
virtual onscreen substitute.


All tablet personal computers have a wireless adapter
for Internet and local network connection.

Tablet PC


Software applications for tablet PCs include office
suites, web browsers, games and a variety of
applications.


Since portable computer hardware components are
low powered, demanding PC applications may not
provide an ideal experience to the user


Tablet PC


Embedded computers


You will find them in all kind of applications that
surround us.


Washing machines, ticket machines at the
Movietowne, camera's, cars, motors, sewing machines,
clocks. Everywhere needing something to regulate,
control of check something.


Embedded computers


It is a special
-
purpose computer used inside a device
that is usually dedicated to specific functions

Home Work


Read pages 9 to 10 (old text)


Read pages 7 to 8 (new text)


Generations of Computers


Answer the following questions


(a) List the components that formed the basis of the
first four generations of computers


(b) What are some of the expected features of fifth
generation computers?