On the basis of work performance, computer can be classified into 3 classes. They are: -
1 Analog computer
An an
alog computer is the one that measure physical values such as temperature or pressure that fall along a continuous scale or variance temperature or pressure. They are generally use for process control in industries. T his computer is poor then digital computer. Analog computers are even less then 1% in use in Nepal.
1 Analog computer
An an
alog computer is the one that measure physical values such as temperature or pressure that fall along a continuous scale or variance temperature or pressure. They are generally use for process control in industries. T his computer is poor then digital computer. Analog computers are even less then 1% in use in Nepal.2 
Digital Computers
These computers are based on binary digits. Binary system is such system of numbering in which only 2 digits are used 0&1. Meaning of 0 is off and 1 is on. Digital computers are mostly used in the preparation of reports, result, tabulation, & graphic representation. Example of those computers is IBM Pc, Apple Macintosh etc.
Digital ComputersThese computers are based on binary digits. Binary system is such system of numbering in which only 2 digits are used 0&1. Meaning of 0 is off and 1 is on. Digital computers are mostly used in the preparation of reports, result, tabulation, & graphic representation. Example of those computers is IBM Pc, Apple Macintosh etc.
3 Hybrid Computers
Hybrid computers comprise both the facilities of analog and digital computer. Hybrid computer can convert analog signals into digital and digital to analog signals these computers are mostly used in spacecraft, bombers, fighters space war, scientific applications and industrial control processes etc.
On the basis of size, computer can be classified into 3 classes. They are
Mainframe computer
These are the largest computers on the basis of large size. A centrally located server or CPU is connected with more than 100 terminals5. Examples of these computers are IBM 1401, ICL 2950/10 etc.
Mini Computer:
Mini computers are medium in size, which means, it is a bigger than microcomputer and smaller than mainframe computer. It is communicate with 50 terminals. At a time at least 50 persons can work with single mini computer for data processing. Examples of these computers are VAX 7500, Digital PDP 11 etc.
Micro Computer:
These are the smallest computer system on the basis of size. These computers are called micro because microprocessor is used as memory device and they are very small. The computers are also called PC (Personal Computer) or home computer. The smallest of this category are laptop, notebook and palmtop computer. The size is reducing day-by-day. Examples of these computers are IBM Pentium PC, Apple/Macintosh etc.
On the basis of brand, computers can be classified into following categories
1. IBM PC (International Business Machines):
IBM Corporation was established in 1924 AD in the USA. IBM is one of the largest computer companies in the world. IBM is one of the leading companies in computer manufacturing. These are reliable, durable, accuracy, strong and they high speed processing.
2. IBM Compatible:
Compatible means principle or ideas that can exist together and the computers manufactured based on IBM principles are called IBM compatible computer. IBM compatible computers are nearly 80% in the world. Some IBM compatible computers used in Nepal are AST, SCAN, ARL (Advance Logic Research), NEC (Nippon Electronic Company), Spectrum, Agtec, Sherry, IT 2000, Litron System, Compaq, Syntax, Wang, Laser etc.
3 Apple/Macintosh Computers
This computer is established from Apple Company by Steve Jobs and Steve Wozniak in 1976AD. All the computers that are developed by Apple Corporation are called Apple/Macintosh computers. These computers are architecturally totally different that that of IBM’s. Not only hardware part, but their software architecture is also totally different. Software made for IBM PC can’t run in Macintosh or vice versa. These computer are mainly used for word processing and generally used for printing like magazines, newspaper etc.
On the basis of size, computer can be classified into 3 classes. They are
Mainframe computer
These are the largest computers on the basis of large size. A centrally located server or CPU is connected with more than 100 terminals5. Examples of these computers are IBM 1401, ICL 2950/10 etc.
Mini Computer:
Mini computers are medium in size, which means, it is a bigger than microcomputer and smaller than mainframe computer. It is communicate with 50 terminals. At a time at least 50 persons can work with single mini computer for data processing. Examples of these computers are VAX 7500, Digital PDP 11 etc.
Micro Computer:
These are the smallest computer system on the basis of size. These computers are called micro because microprocessor is used as memory device and they are very small. The computers are also called PC (Personal Computer) or home computer. The smallest of this category are laptop, notebook and palmtop computer. The size is reducing day-by-day. Examples of these computers are IBM Pentium PC, Apple/Macintosh etc.
On the basis of brand, computers can be classified into following categories
1. IBM PC (International Business Machines):
IBM Corporation was established in 1924 AD in the USA. IBM is one of the largest computer companies in the world. IBM is one of the leading companies in computer manufacturing. These are reliable, durable, accuracy, strong and they high speed processing.
2. IBM Compatible:
Compatible means principle or ideas that can exist together and the computers manufactured based on IBM principles are called IBM compatible computer. IBM compatible computers are nearly 80% in the world. Some IBM compatible computers used in Nepal are AST, SCAN, ARL (Advance Logic Research), NEC (Nippon Electronic Company), Spectrum, Agtec, Sherry, IT 2000, Litron System, Compaq, Syntax, Wang, Laser etc.
3 Apple/Macintosh Computers
This computer is established from Apple Company by Steve Jobs and Steve Wozniak in 1976AD. All the computers that are developed by Apple Corporation are called Apple/Macintosh computers. These computers are architecturally totally different that that of IBM’s. Not only hardware part, but their software architecture is also totally different. Software made for IBM PC can’t run in Macintosh or vice versa. These computer are mainly used for word processing and generally used for printing like magazines, newspaper etc.
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