Input, Processing and Output

Topics: Computer, Personal computer, Input device Pages: 8 (2391 words) Published: July 11, 2013
Input Device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or other information appliance.

A keyboard is the most common input device. Using a keyboard, the user can type the text and execute commands. Keyboard is designed to resemble a regular typewriter with a few additional keys. Data is entered into the computer by simply pressing various keys. The layout of a keyboard comes in various styles but QWERTY is the most common layout. The layout of the keyboard has changed very little ever since it was introduced. In fact, the most common change in its technology has simply been the natural evolution of adding more keys that provide additional functionality. The number of keys on a keyboard varies from 82 keys to 108 keys. Portable computers such as laptops quite often have custom keyboards that have slightly different key arrangements from a standard keyboard.

Pointing devices are the input devices by which we can point out and select the items rapidly from the multiple options displayed on the screen. These devices can also be used to create graphic elements on the screen such as lines, curves and freehand shapes. The most common types of pointing devices available are: a) Mouse

b) Trackball
c) Joystick
d) Touch Screen
e) Light Pen
d) Touch Pad

a) Mouse 
A mouse is a small hand-held pointing device, which is used to create graphic elements on the screen such as lines, curves, and freehand shapes. It is also used to run a program and pull down a menu in GUI (Graphic User Interface) base computer system. It is rectangular shaped with a rubber ball embedded at its lower side and buttons on the top. Usually a mouse contains two or three buttons, which can be used to input commands or instructions.

A mechanical mouse uses a rubber ball at the bottom surface, which rotates as the mouse along a flat surface to move the cursor. It is the most common and expensive pointing device. Microsoft, IBM and Logitech are some well-known makers of the mechanical mouse.

An optical mouse uses the light beam instead of rotating ball to detect the movement across a especially patterned mouse pad. As the mouse rolls the mouse on a flat surface, the cursor on the screen also moves in the direction of the mouse’s movement. It is more expensive in comparison with the mechanical mouse. Modern optical mouse are accurate and often do not need a mouse pad.

A track ball is another pointing device that uses a ball which is settled in a square cardle. In general, a track ball is just like a turned upside down a mouse. The ball is rolled by fingers to move the cursor around the screen. A track ball requires less space than a mouse for operation because the whole device is not moved for moving the curser. It is often attached to or inbuilt into the keyboard. The trackball built into the keyboard are commonly used in laptop computers, because the mouse is not practical for laptop users in a small space. This pointing device comes in various shapes but with the same functionality. It works like a mouse.

With the new Wedge Touch Mouse, you can comfortably navigate Windows 8 using Microsoft’s touch technology—while at the same time wowing those around you with a mouse that looks and feels like no other. It packs full functionality into a compact frame that’s great for your mobile lifestyle. Small enough to fit in your pocket, it’s the perfect companion for your laptop or tablet when you’re on the go. Plus the artful, minimalist design (complemented by high-quality materials and craftsmanship) gives you fluid, four-way touch scrolling and navigation in every direction. Not only is Wedge Touch Mouse compact, it doesn’t come with cables or USB transceivers. Just turn it on and connect it to your Bluetooth-enabled laptop or tablet. Additionally, BlueTrack technology means it tracks on virtually any surface, whether you’re at a...
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