Computers can be classified into various classes :-
1) On the basis of working principal
a) Analogue computer :-
Analogue computers measures continuous types of data & us
es a physical quantity to present & process the data. We have seen many analogue devices in our life. It represent numbers by a physical quantity; that is , they assign numeric values by physically measuring some actual property. Speedometer, Thermometer, Multimeter, Fuel & price indicatior in petrol pump are the examples of analogue computer.
b) Digital computer :-
The computer which accepts discrete data as per the electric signals is known as digital computer. We can easily operate by putting it on the table. It is mostly used for data processing, text formatting, designing, entertainment purpose, etc. We ca use e-mail internet too. 90 % computers are digital computers.
c) Hybrid computer :-
Hybrid computer is the combination of analogue & digital computers. It is mostly used by the doctors, engineers, pilots, etc. CT Scan machine which is used in hospitals to find out the specific disease, it is also the example of hybrid computer. It is special purpose computer.
2) On the basis of Size :-
a) Mainframe computer :- Mainframe computer is large computer which processes at high speed & occupies a large capacity to handle huge numbers of records. More than hundred people can work at a time & communicate with different countries with wide area network via satelite. Mark-I is one of the example of mainframe computer which has made on the basis of vaccum tube. Such computers can be seen in the universitiesm government or large scale organizations, institute of engineering, scientific research centers.
b) Mini computer :- Mini computer are mmedium in size than mainframe computers but larger than micro computers. It is specially used in data processing, desktop publishing field, programming, etc.
c) Micro computer :- Micro computer is also known as PC (personal computer) or home computer. It is made by using micro processors. It is widely used at homes & offices. Many brands, model & sizes are available in microcomputers. It is used in many fields of business, education, desktop & graphic designing, data processm etc. micro computers can be such categorized into :-
i) Desktop computer :- a personal computer or sufficient to fit on desk.
ii) Laptop computer :- a portable computer complete with an integrated screen & keyboard. It is generally smaller in size than a desktop computer & larger than a notebook(palmtop) computer. It is sufficient to fit in our bag.
iii) Palmtop (notebook) computer :- a hand-size computer like a mobile. Palmtops have no keyboard but the screen serves both as an input & output device. It is sufficient to fit in our pocket.
3) On the basis of brand :-
a) IBM PC :- IBM PC (international business machine company) has established in 1942 in United States of America. The computers manufactured by IBM company are called IBM computers. It is very expensive.
b) IBM Compatible :- Computers developed on the principals of IBM computers are called IBM compatible. It can perform all the tasks that an IBM computer does. It is less expensive than IBM original computer. a personal computer that is compatible with the IBM PC is called IBM compter.
c) Apple/Macintosh :- The computers manufactured by the apple company is called apple computer. It is mainly used for desktop designing. It is quite expensive than IBM & IBM compatible.
1) On the basis of working principal
a) Analogue computer :-
Analogue computers measures continuous types of data & us
es a physical quantity to present & process the data. We have seen many analogue devices in our life. It represent numbers by a physical quantity; that is , they assign numeric values by physically measuring some actual property. Speedometer, Thermometer, Multimeter, Fuel & price indicatior in petrol pump are the examples of analogue computer. b) Digital computer :-
The computer which accepts discrete data as per the electric signals is known as digital computer. We can easily operate by putting it on the table. It is mostly used for data processing, text formatting, designing, entertainment purpose, etc. We ca use e-mail internet too. 90 % computers are digital computers.
c) Hybrid computer :-
Hybrid computer is the combination of analogue & digital computers. It is mostly used by the doctors, engineers, pilots, etc. CT Scan machine which is used in hospitals to find out the specific disease, it is also the example of hybrid computer. It is special purpose computer.
2) On the basis of Size :-
a) Mainframe computer :- Mainframe computer is large computer which processes at high speed & occupies a large capacity to handle huge numbers of records. More than hundred people can work at a time & communicate with different countries with wide area network via satelite. Mark-I is one of the example of mainframe computer which has made on the basis of vaccum tube. Such computers can be seen in the universitiesm government or large scale organizations, institute of engineering, scientific research centers.
b) Mini computer :- Mini computer are mmedium in size than mainframe computers but larger than micro computers. It is specially used in data processing, desktop publishing field, programming, etc.
c) Micro computer :- Micro computer is also known as PC (personal computer) or home computer. It is made by using micro processors. It is widely used at homes & offices. Many brands, model & sizes are available in microcomputers. It is used in many fields of business, education, desktop & graphic designing, data processm etc. micro computers can be such categorized into :-
i) Desktop computer :- a personal computer or sufficient to fit on desk.
ii) Laptop computer :- a portable computer complete with an integrated screen & keyboard. It is generally smaller in size than a desktop computer & larger than a notebook(palmtop) computer. It is sufficient to fit in our bag.
iii) Palmtop (notebook) computer :- a hand-size computer like a mobile. Palmtops have no keyboard but the screen serves both as an input & output device. It is sufficient to fit in our pocket.
3) On the basis of brand :-
a) IBM PC :- IBM PC (international business machine company) has established in 1942 in United States of America. The computers manufactured by IBM company are called IBM computers. It is very expensive.
b) IBM Compatible :- Computers developed on the principals of IBM computers are called IBM compatible. It can perform all the tasks that an IBM computer does. It is less expensive than IBM original computer. a personal computer that is compatible with the IBM PC is called IBM compter.
c) Apple/Macintosh :- The computers manufactured by the apple company is called apple computer. It is mainly used for desktop designing. It is quite expensive than IBM & IBM compatible.
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