Chapter - 2 Classification of Computer

Computers are classified according to working principle, size, brand and model. A single computer can be microcomputer on the basis of size, IBM compatible on the basis of the brand, AT computer on the basis of model and digital computer on the basis of working principle,
Classification of computer
           1.    On the basis of working principle
a)      Analog computer
b)      Digital Computer
c)      Hybrid Compute
2.   On the basis of Size
a)      Super Computer
b)      Mainframe Computer
c)      Mini Computer
d)      Micro Computer
3.    On the basis of brand
a)      IBM PC
b)      IBM compatible PC
c)      Apple/Macintosh Computer
4.     On the basis of model
a)      XT computer
b)      AT Computer
c)      PS/2 Computer

2.1  On the basis of working principle

a)      Analog Computer
Analog Computer is a Greek word which means similar. The similarities between two quantizes are measured by electrical voltage or current. The computer which work with the natural phenomenon and physical values like frequency, earthquake, volcano, flow of water, speed of wind, weight, light etc are called analog computer. The analog computers are based on continuous data and their output is also continuous in the form of graph. The analog computers are not built for general purpose but analog devices are broadly used in our daily life. Examples of analog computer: - Presley, AKAT – I, ELWAT and some other analog devices are speedometer, thermometer, seismograph, analog watch etc.
Characteristics of analog computer
·         It works on continuous data.
·         It is specific to a particular task. Hence, it is not versatile.
·         Accuracy of analog computer is not so high in computerized to digital computer.
·         Generally, analog computer does not have storage capacity as it works on real time basis.
·         It also gives the output in the form curve line or graph so it may not be meaningful to all.

b)      Digital Computer
The computer which works on discrete data (discontinuous data, binary system or 0 or 1) is called digital computer. The digital computer works by counting rather than measuring values or by the presence or absence of electric pulse in the signals. It is multipurpose and programmable. So, it is high cost, fast processing, more accurate and has larger memory capacity. Examples: IBM PC, IBM compatible, Apple/Macintosh Computer etc.
Characteristics of Digital computer
  • It works on discontinuous or discrete data.
  • It works by counting the values rather than measuring.
  • It is a general purpose computer. Hence, it is versatile.
  • The accuracy of digital computer is very high i.e. always 100%.
  • It has large storage capacity and faster processing speed.
  • It is completely flexible computer and it can be easily reprogrammed according to the requirement of user.

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