Lately one of my friends asked me one question, “Why do the search engines, like Google, have only blogs on their first top 10 pages instead of websites or forums these days?” My answer was I am a blogger and from my experience it must be due to our hard work. It was supposed to […]

In the case of computer we can find many storage devices such as RAM, ROM, hard disk etc. But these are found inside the CPU of the computer used to store different mass of instructions, data, programs etc. and are simply called as internal devices. These devices help to store data, instructions, etc. temporarily like […]

The input device which helps to read the bar code is called barcode readers. This method uses a number of lines of varying thickness and spacing between them to indicate the desired information. An optical barcode reader can read such bars and convert them into electrical pulses to be processed by a computer. Bar codes […]

The universal serial bus is referred as USB. It is a high speed serial bus that transfers data at higher rate than that of a serial port (port that allows serial data transfers). USB allows interfacing several devices to a single port in a daisy chain for support in a wide range of peripheral such […]

Magnetic Ink Character Reader (MICR) is an input device widely used by banks to process large volume of checks and deposit forms written everyday. It consists of special ink called magnetic ink (i.e. an ink that contains iron oxide particles) is used to write characters on the check and deposit forms to be processed by […]

Voice input system is a system which gives access to computer without keyboard. It will become much easier and faster to use a computer without keyboard. Talking with a computer is incredible. Attempts have been made to develop a computer that can listen to the users and talk to them. The voice input to the […]

Printers are commonly used output device. The most common method of producing human readable output is using printers. Printed output is usually referred to as hard-copy and they provide information in a permanent readable form. They produce printed output of results, programs, and data.
We can use different kinds of printers with computer:

Character Printers
Line Printers
Page […]

Plotter is an output device that draws pictures on paper based on commands from a computer. They are used to produce precise and good quality graphics and drawings under computer’s control. They use ink pen or ink jet to draw and other single color or multicolor pens can be used. The pens are driven by […]