Types of computer

The major classification of computer are

1. On the basis of work
2. On the basis of size
3. On the basis of brand
4. On the basis of model

1. On the basis of work

• Analog Computer:An analog computer measures the physical values such as temperature or pressure.Analog computers are faster than digital.Speedometer and seisomography are also an analog computer.It is useful in kidney and mental diseases.PLESLY is an analog computer used in International Telecommunication System.Analog computers are used in thefield of science,technology,school,college,business etc.
  

• Digital Computer:It directly counts number or digits represents numbers ,letters or other special symbols.It doesnot measures the distance or liters of petrol etc.Digital computer doesnot work countinuously.Digital computers are used in the preparation of reports,result tabulating and graphic representation . Digital computers helps in mahtematical engineering,counting,statstics...etc.

• Hybrid Computers:Hybrid means the combination of work.The combination of the analog and digital computers is called Hybrid computers.It can transfer data from analog to digital and vice versa.Hybrid computers are used in big industries ,scientific research center,institution, airplanes, etc.In an intensive care unit of hospital ,for experiment analog device measures patient's heart function ,temperature or other vital sign.

2.On the basis of size:

• Mainframe Computer:Mainframe means a big computer which process at a high speed and occupies a big space.These computer have faster processing speed and greater storage capacity.These computer need 100 sq ft.space.This amchine have big capacity of processing task.About 100 people can work in this computer at a time.This computer can communicate with a country at a distance vis satellite and transfer data can take place.
• Mini Computer:Medim in size but smaller than mainframe and bigger than micro computer. This required small space than mainframe .It can communicate with 50 terminal.It can be used in Local Area Network and are less expensive.This computer is faster than micros.The series of mini computers are PDp1, The Prime series ,Ap3 , As-400 etc.
• Micro Computer: Micro Computer are based on microchips . It is also called Home computer or Personal Computer.Micro Computer are extensively used at home and offfice.Its capabilities and speed have increased .It is available at many brands, model and sizes.They are Laptop,Pocket,Pocket computer and notebook. They can communicate with LAN or MAN with the help of MODEM.

3.On the basis of brand:

• IBM PC:International Business Machine Corporation was establised in 1942 inUSA . The computer manufactured by this company are called IBM computer.IBM computers are reliable,strong and they posses high speed processing.
• IBM Compatible:Compatible means principles or ideas that can exist together.HTese computer can perform all the tasks that an IBM computer does. The Architectural design of these computer are similar to that of IBM computers.
• Apple Macintosh computer:Apple computer was establised in USA ,in late 1970s.It develop diferent type of Computers ,more than that of IBM in architectural and ystem configuration as well.The software used in this are much better because they are friendly and easy to handle.Macintosh is a new brand of Apple Computer.

4.On the basis of Model:

• Xt Computer:Xt computer were based with the processor named 8086.Later some changes were made in the main processor of the computer.
• AT Computer:Advanced technology computer are are faster than Xt computer.In these computer math co-processor are used to suppliment the airthmetic section of the main processor which enable us to process complex mathematical problem.
• PS\2:This computer is more faster than IBM and IBM Cpompatible.Its architectural design is advanced than other.