What is a computer?

It is one of the mainly new and dominant tools forever developed. It is situated in the company of the wheel, the aircraft wing and even in the internal ignition engine because of the remarkable changes it has and still carry on to make in our lives.

Mutually with its close cousins, the Internet and the web, an overall, instant communications network now survive in a way no one ever dreamed of when the first business computer emerged in 1981.

This Web site was produced to assist non-technical users to acquire full benefit of this great technology. On the surface, its mechanism is not at all perceptive, and probably appears somewhat unexplained. It is just the reverse it is a very well controlled, reasonable machine.

Where do we begin?

There are remarkable ways to learn any system. One is by performance of each section. And the Hardware each and every part of the PC is explained to present the necessary details of how each device operates. This kind of investigation by itself doesn't give details of the how the PC functions as a unit.

In the PC Basics we going to discuss about the several devices in a PC and how what are their main task and how they operates mutually.

Processor – Every computer has it own processor which is like the heart of every computer and mainly named as CPU (central processing unit). The CPU is being installed on the motherboard in the processor socket and at present they are available as pinless which has many chips as well as electronic circuit in the internal core of the processor. The CPU and other devices operate mutually according to the program list, and calculate and control all that occur in the computer.

You've maybe seen the 'Intel Inside' showed in many computer sales ads. They are referring to the Intel CPU which is frequently a Pentium or Celeron processor.

• Input – The input devices are those which permit the user to direct the action of the PC. The keyboard and mouse allow you to organize the computer by giving it commands (input).

• Output – The output devices are those which generate the results to the users. The monitor or the printer is the output device even the speaker act as output device.

• Memory – The computer has two memory first is the RAM and the other is called as Rom the RAM is volatile as well as ROM is a non-volatile memory and the RAM temporarily store results of calculations or files passed from the hard drive. The Memory operates very quickly and the data is lost from the PC when the computer is shutdown.

• Storage – The Hard Drive as well as CD-ROM are the storage devices they are not too fast as compared to memory but they are capable to store more data permanently even when the computer is shutdown.

• Software – These are the commands, which are also known as programs or code. The CPU and software work very directly together. Each one by itself is ineffective. Only when they work properly together they can direct and perform activities in the PC.


Following is the chart which shows the components,assembled together functionally. Arrows show how they interconnect.



The PC and the ATM

What do a PC and an automated teller machine has in general. They are both computer based systems. By explaining the function of an ATM it may help you see how information runs in a computer based system. The computer is all-purpose. It can run lots of unusual types of software that do a wide range of equipment.

The ATM has all the useful essentials of a Computer: processor, memory, storage, input, output and software. Like the PC, it can attach to distant computers through internet services in order to obtain your bank account and decide whether or not to allow dealings.

The ATM can be idea of a expert Computer which is being specifically designed to do a very limited set of business. It takes in deposits; distribute withdrawals and also prints out account details.

The ATM software exists in in a local or distant storage device and runs on a central processing unit most likely a microprocessor or micro controller. It is planned to sit and wait for you, the user, to tell it what to do.

After the ATM has examine your card and you have effectively entered your PIN (Personal Identification Number), which for the time being stores in memory, and the user can very easily complete the operation and with the help of the keypad the user have to select the account and the amount to be withdrawn by him. And the user have to wait till the processor does not confirm the exact user and during this time try to think what the ATM is doing and these can be seen by a display which shows you the output status message.

And the ATM processor also confirm whether the user account is active or not and is their adequate balance to continue. And then the machine slides out the cash in the cash provision door which is another output device of the machine. Its then request you by way of the display if you want to make one more operation. Based on your input it takes the correct decision.