Types of Computer : Classification on signals

Two types of computers based on internal signaling are analog computers and digital computer. An analog computer represents quantities by physical analogies. It represents physical quantities, such as distance, velocity, acceleration, temperature, pressure, or angular position, force etc, by mechanical or electrical parameters.

An automobile speedometer is an example of an analog-computing device. It converts the rotational rate of the drive shaft of an automobile into the numerical value of the speed of the vehicle, similarly, a thermometer functions as an analog device by converting the movement of a column of a column of mercury into a temperature reading.

Analog computers are ideal in situations where data can be accepted directly from measuring instruments. The ability to collecat data at high speeds and to process data at equally high speeds, makes analog computers uniquely suited to controlling processes of oil refineries, steel mills, weapon systems and similar other operations.

An analog computer does not require any storage capability. The out from an analog computer is generally in the form of readings on a dial or a graph plotted on paper.

Analog computers were in use before the intention of the digital computers. There are far more digital computers in use today than analog computers. This book concentrates on digital computers.


Types of computers : Classification based on purposes

There are either special-purpose or general-purpose computers. A special-purpose computer is designed for a specific application. It is also known as dedicated computuer. Many such computers have instructions permanently programmed into them that are designed to perform only one major function. Special-purpose computers are used to control traffic lights, to control the collection of tolls on highways, and in automobiles, weapons, appliances and hands etc.


Importsance and limitations of Computer

Storage, processing and dissemination of information play a very important role in modern information society. Computers, telecommunications, data and computuer communications contribute tremendously to these activities. Computers and electronic communications are getting closer and closer every day. Computers, electronic communications and other technologies associated with automation come under the general term of information technology. Information technology influences our lives and its impact on society is increasing day by day.


Components of a Computer System

A computer is used to process data and a data processing system consists of more than just machines. A computer system must contain.

1) Hardware
2) Software
3) Humanware and
4) Operational procedures.


Basic Organization (Computer Basics)

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I hope this post is very usefull to you. So not late. I start my main writing.

A computer is an electronic machine that stores, retrieves, and processes data. It cannont think or reason ; it can only carry out instructions given to it. A set of instructions that directs its actions is called a program. Different programs are used to solve different problems. Ability to accept, store and execute programs makes the computer an invaluable and all-purpose business tool.


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