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 […]

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 […]

Microprocessor is a square chips in which millions of components are integrated together in different layers. The main characteristics of a microprocessor are the widths of its internal as well as external address bus and data bus, clock rate and its instruction set. The first commercial microprocessor was the intel4004 which appeared in 1971 was […]

Liquid crystal display device is commonly known as LCD. It is a liquid crystalline material squeezed in between two glass or plastic plates. The front plate contains coating of this film and is transparent and conductive. The back plate is reflective. Its segments are in the shape of desired characters. On the back plate an […]

A CRT (Cathode ray tube) display unit is a commonly used output device. The VDT (Visual Display Terminal) unit contains CRT for visual display unit displays the data and information received from the computer in alphanumeric characters and graphs. CRT being an output device can also perform limited input function when used in conjunction with […]

A hard disk drive contains rigid disk shaped platters, usually constructed of aluminum or glass which cannot be bent like floppy disc hence termed as hard disk. Since the platters cannot be removed they are sometimes called fixed disk drives.
The physical constructions of the hard disks contains of spinning disks with the heads that move […]

Floppy disk is a soft magnetic disk, very thin piece of flexible plastic made of Mylar (a plastic material) coated with magnetic material (iron oxide or barium ferrite). It is called floppy disk because it is flexible and can be bent unlike hard disk. Floppy disks are also called diskette and are removable disk, inserted […]

A mouse is a type of input device. It is a small hand-held device that helps to position the cursor on the screen. The cursor makes easy for the selection from a displayed menu by positioning the cursor over the required selection by moving the mouse and pressing on the mouse to indicate the selection […]