TYPES OF COMPUTER

Computer is an electronic device which accepts the input and processes them to give desired output. There are various types of computers available onthe market.Computer are classified on the basis of work, on the basis of size, on the basis of model and on the basis of brand. It is also divided into general purpose and special purpose. General purpose computers are the digital computer and special purpose computer are mostly analog and hybrid computer. This classification is according to the working principle or function of the computers.
On The Basis Of Work
1. Analog Computer
An analog computer is one that measures physical values such as temperature or pressure that fall along a continuous scale in temperature or pressure. For example, a service station gasoline pump contains an analog processor and analog device that converts fuel measurements into quantity and price values. The term amalog computer is derived from a Greek word Analog.
2.Digital Computer
A digital computer is one that directly counts numbers or digits that present numbers, letters or other special symbol. Digital computer does not measure the distance or does not measure how many liters of petrol are taken or what is the pressure of compressions etc.Digital computer are the most used computer for report, documentations, billing and other graphical work.
3.Hybrid Computer
These are the computers, which work in digital as well as analog computer type. The good qualities of analog and digital computer are combined on these computers made the hybrid computer. These are used on Intensive care unit of hospital, jet planes and others data analysis terminals.Hybrid computer transfer the data from analog to digital to analog and vice versa.
On The Basis Of Size
1.Super Computer
Mullti-user, multiprocessor large computer of very high efficiency and storing capacity is called super computer able to solve a difficult problem within a nana seconds. A number or RISC(Reduce Instruction Set Computer)processors are used. Its word length is 64 bits. For eg: CRAY,XMP/14, CDC-205 etc.
2.Mainframe Computer
It is also very powerful multi-user computer used in large business organizations, industries and defense to process data of complex nature. It can response several CPU for data processing.More than 100 user can use at a same time because it work on time sharing mode.For examples: IBM4300 Series, ICL39 Series & IBM1401 etc.
3.Mini Computer
Mini computer is general purpose computer which is smaller than mainframe and super computer. Mini computer has limited data channel capacity and limited software is available.Example- AS/400, AP-3,PRIME Series etc. They cam be maintained and operated easily.
4.Micro computer
They are the smallest general purpose computers. They are easy to handle and are used in difersnt application areas like business, engineering, schools etc. Micro computer are general purpose computer which can do a variety of jobs.Micro computer are also called personal computer.Example:IBM PCs, Apple Mac, IBM PS/2 etc.
On The Basis Of Model
1.XT: Xt is acronym for Extra Technology and had a processing speed 4077MHz. XT computer has 8086 or 8088 microprocessor. It was released in 1983.
2.AT: AT is acronym for Advance Technology and is faster than XT.AT computer have higher capacity of RAM and are expensive. The microprocessors used in AT are 80286 SX,80286 DX,80386 SX,80386 SX
3.PS/2: These computer were released in 1990. The processing of this computer is higher than AT computer.Most of Laptop computer manufactured by IBM are based on PS/2.
On The Basis Of Brand
1.IBM PC: IBM PC is acronym for international Business Machine Personal Computer. These are micro computer made by IBM company. These computer are more reliable, durable and have better quality.
2.Apple'Macintosh: Apple company of USA developed Apple 'Macintosh computer .The Apple computer have their own hardware and software.