Types of Computer
Computer is an electronic device which accepts the input and processes them to give desired output .There are various types of computer available in the market .Computers are broadly divided into the following four groups:
- On the basis of fork / functions
- On the basis of size
- On the basis of brand
- On the basis of model .
On the basis of Work/Function
Analog ComputerAnalog computers solve problems by using continuously changing data such as temperature pressure or voltage .Analog computers are used for scientific and engineering applications examples of analog devices are : Thermometer , Speedometer ,example of analog computer is Plesley .
 |
| Fig of Analog Computer |
Digital Computer
Digital computers are mainly general –purpose computers that represent and store data in discrete quantities or numbers ,In these computers all the processing is done in terms of numeric representations(bnaryu dgits ) of data and informations .Although the user enters data in decimal or character form ,it is converted into binary digits (0’s and 1 ‘s ) .Almost all the computers used at present are digital computers .
 |
| Fig of Digital Computer |
Hybrid computers are the combinations of Analog and digital computes ,such computes store and process analog signals which have been converted into discrete numbers using analog to digital converters .they canalso convert the digital numbers into analog signals or physical properties using digital to analog converters ,Hybrid computers are mainly used in artificial intelligence (robotiecs) and computer added manufacturing (process control )
 |
| Fig. of Hybird Computer |
On The Basis of Size And Volume
Nowadays ,computers are available in different seizes and with different capabilities .On the basis of size ,computers are classified as follows :Super Computers
Super computers are the fastest ,most expensive and largest computes in the world and processing extremely large 10 times faster than other computers .super computers are used for weather forecasting,earthquake predictions,and scientific research .
Examples :-PARAM,CRAY-1 ,CDC CYBER 203,CRAY X MP etc .
 |
| Fig. of Super Computer |
Mainframe computers are medium or largest powerful and expensive computers .They carry out different tasks for thousands of users simultaneously .they execute billions of instructions per second and process large volume of data simultaneously .they operated by trained personal and kept in air conditioned rooms .they are used by large companies like gas and electricity suppliers airlines ,police etc .
 |
| Fig. of Miniframe Computer |
Mini computers are known as a” mid –size computers “ .they are used for doing powerful jobs which could ,once ,only be performed mainframes .A mini computer is multiprocessing system .It is capable os supporting 4 to 200 users simultaneously .they are used by small to medium sized business to manage their data processing needs .
Example:
IBM sys / 3, PDP– ii, Hewlett packard 3000 etc .
 |
| Fig. of Mini Computer |
Micro computer is a computer that depends on a microprocessor . It is the smallest general purpose computer .It is also known as personal computer (PC) as they are used by a single person at a time .Microcomputers are mostly used in office application,homes,classroom,shops.business ,entertainment etc.
 |
| Fig. Micro Computer |
It is a types of personal computer that is designed to fir comfortably on the top of the desk ,typically a monitor sitting on the top to the computer .A desktop computer is mainly used for general purpose tasks such as data entry ,desktop publishing etc.
 |
| Fig. of Desktop Computer |
ii. Laptop Computer
Laptop computers are portable computers that are mainly used by people who need computing resources everywhere they go.
Laptop computers are powerful as moderate PC s ,and their size and weight are such that they can bar used comfortable by placing them on ones lap .It contains attached keyboard ,a flat LCD display ,a touch pad ,CD/ DVD drive etc. .A laptop is more expensive than a normal PC .
 |
| Fig. of Laptop Computer |
A handheld computer is small computing device that can be used comfortably by holding it in hand .It is also known as palmtop computer because It can be kept on palm and operated .Handheld computers are gradually becoming computing device of choice for people requiring computing power anytime, anywhere .
Some popular handheld computers are :Tablet Pc , PDA/Pocket PC ,smartphone etc. .
 |
| Fig. of PDA |
| Fig. of Smart Phone |
 |
| Fig. of Tablet PC |
On The Basis Of Brand
Computers are classified on the basis of brand also .Many companies are involved in manufacturing computer through the world .Many brands of computer are available in the market .On the basis of brand ,the following three categories are available .IBM PC (IBM personal Computer )
IBM PC is one of the leading companies of the world in manufacturing computers which established in 1923 Ad .the computers manufactured by IBM are called as IBM PC or IBM brand computer .These computers are more reliable ,durable and have better quality and cost originally was very high but now days the cost has gone down.
 |
| Fig. of IBM PC |
The computers that are manufactured by other computer manufacturing companies by have the same technology and features of IBM PC are the known as IBM compatible .All the software and programs ,which run in IBM PC can equally run in IBM compatible .IBM compatible computers are cheaper and their parts easily available in the market .therefore , they are popular in the world .Most of the microcomputers used in Nepal are IBM compatibles.
 |
| Fig. of IBM Compatible |
The computer manufactured by apple company with different architecture is called apple /’ Macintosh computers .this company was established in the USA in 1970 ./these computers are some way different from IBM computers and the software used in apple computers does not run in IBM computers .Apple company manufactured new brand computer popularly known as Macintosh .
 |
| Fig. of Apple /Macintosh |
On The Basis of Model
On the basis of model computers are classified as follows :XT computer ( Extended technology )
The computers having 8086 or 8088 microprocessor are called as XT computers.They are slower in speed (4.77 MHZ) They cannot run advance version of software or programs
.
AT COMPUTER
The computer having 802886 or later version of microprocessors are known as AT computers .The storage capacity as well as speed is much higher than XT computers .Besides that they have math – processor to support the main processor to perform complex mathematical calculations.
PS2 (personal system -2)
IBM developed another model of computers in 1990 that have advanced architectural design than AT computers .They are known as PS/2 computers .They are much faster than AT computers most of the laptop computers are based on PS/ 2 model .
Comments
Post a Comment