Topics: Input device, Computer graphics, Computer Pages: 10 (2086 words) Published: November 25, 2013
What are the four types of microcomputer hardware?
1. Input device
2. Unit Processor
- consists two parts: central processing unit (CPU) and main memory - CPU is divided into two main parts: a control unit and arithmetic/logic unit + registers 3. Auxiliary storage device
4. Output device
Input device
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In computing, an 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. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks. Many input devices can be classified according to:

modality of input (e.g. mechanical motion, audio, visual, etc.) the input is discrete (e.g. key presses) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous) the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CAD applications) Pointing devices, which are input devices used to specify a position in space, can further be classified according to: Whether the input is direct or indirect. With direct input, the input space coincides with the display space, i.e. pointing is done in the space where visual feedback or the pointer appears. Touchscreens and light pens involve direct input. Examples involving indirect input include the mouse and trackball. Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g. with a mouse that can be lifted and repositioned) Direct input is almost necessarily absolute, but indirect input may be either absolute or relative.[clarification needed] For example, digitizing graphics tablets that do not have an embedded screen involve indirect input and sense absolute positions and are often run in an absolute input mode, but they may also be set up to simulate a relative input mode like that of a touchpad, where the stylus or puck can be lifted and repositioned. Input and output devices make up the hardware interface between a computer and a scanner or 6DOF controller. Contents

1 Keyboards
2 Pointing devices
3 High-degree of freedom input devices
4 Composite devices
5 Imaging and video input devices
6 Audio input devices
7 Further reading
Main article: Computer keyboard
A 'keyboard' is a human interface device which is represented as a layout of buttons. Each button, or key, can be used to either input a linguistic character to a computer, or to call upon a particular function of the computer. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards. Examples of types of keyboards include:

Computer keyboard
Chorded keyboard
Pointing devices
Main article: Pointing device

A computer mouse
Keyboard devices are the most commonly used input devices today. A pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touchpads, this is usually achieved by detecting movement across a physical surface. Analog devices, such as 3D mice, joysticks, or pointing sticks, function by reporting their angle of deflection. Movements of the pointing device are echoed on the screen by movements of the pointer, creating a simple, intuitive way to navigate a computer's GUI. High-degree of freedom input devices

Some devices allow many continuous degrees of freedom as input. These can be used as pointing devices, but are generally used in ways that don't involve pointing to a location in space, such as the control of a camera angle while in 3D applications. These kinds of devices are typically used in CAVEs, where input that registers 6DOF is required. Composite devices

Wii Remote with attached strap
Input devices, such as buttons and...

References: 12. Jump up ^ "output device". A Dictionary of Computing. Oxford University Press. 2008. Retrieved 3 June 2012.
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