on the basis of working principle

 We have following computers on the basis of working principle/mechanism.

1)Analog computers

2)digital computers

3)Hybrid computers

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Let's know in detail.

1)Analog computers:-

                         An analog computer is a form of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. In contrast, digital computers represent varying quantities symbolically, as their numerical values change.

       Features:      

1. uses variable like pressure,temperature etc whose values vary continuously.

2. uses sine wave.

3. It records waveforms as they are.

4. may subject to deterioration of wave by noise.

5. more likely have low accuracy

6. hardware is not so flexible

7. best suited for audio and video transmission

8. consumes less bandwidth

9. error prone

e.g. Plesley,speedometer etc

2)digital computers:-

                    Digital computer is a computer which stores data in terms of digital numbers and proceeds in discrete steps from one state to another.

        Features:-

            

1. does not use variable concept; rather uses discrete values to represent information.

2. uses square wave (for max and min voltage)

3. waveforms are converted into numbers to record information.

4.  without deterioration during transmission 

5. high level of accuracy

6. Digital hardware is flexible

7. for any type of computing

8. consumes more bandwidth

9. mostly free from errors

                                                                picture source:theintactone.com

3)Hybrid computers:-

                    Hybrid computers are computers that exhibit features of analog computers and digital computers. The digital component normally serves as the controller and provides logical operations, while the analog component normally serves as a solver of differential equations.

        Features:-

        
It is combination of qualities analog and digital computers.

2.  It can process both continuous and discrete data.

3.  It has capability to convert one type of data to another.

4.  It is the special purpose machine.

5.  It is mostly used in airplane, hospital, weather forecasting.

6.  It usually has high cost compared to analog and digital.

Examples: HRS 100, radar, XPC 100, GVS 100.