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mouse
Last modified: Friday, November 21, 2003 

A device that controls the movement of the cursor or pointer on a display screen. A mouse is a small object you can roll along a hard, flat surface. Its name is derived from its shape, which looks a bit like a mouse, its connecting wire that one can imagine to be the mouse's tail, and the fact that one must make it scurry along a surface. As you move the mouse, the pointer on the display screen moves in the same direction. Mice contain at least one button and sometimes as many as three, which have different functions depending on what program is running. Some newer mice also include a scroll wheel for scrolling through long documents.

Invented by Douglas Engelbart of Stanford Research Center in 1963, and pioneered by Xerox in the 1970s, the mouse is one of the great breakthroughs in computer ergonomics because it frees the user to a large extent from using the keyboard. In particular, the mouse is important for graphical user interfaces because you can simply point to options and objects and click a mouse button. Such applications are often called point-and-click programs. The mouse is also useful for graphics programs that allow you to draw pictures by using the mouse like a pen, pencil, or paintbrush.

There are three basic types of mice:

  1. mechanical: Has a rubber or metal ball on its underside that can roll in all directions. Mechanical sensors within the mouse detect the direction the ball is rolling and move the screen pointer accordingly.
  2. optomechanical: Same as a mechanical mouse, but uses optical sensors to detect motion of the ball.
  3. optical: Uses a laser to detect the mouse's movement. You must move the mouse along a special mat with a grid so that the optical mechanism has a frame of reference. Optical mice have no mechanical moving parts. They respond more quickly and precisely than mechanical and optomechanical mice, but they are also more expensive.

Mice connect to PCs in one of several ways:

  1. Serial mice connect directly to an RS-232C serial port or a PS/2 port. This is the simplest type of connection.
  2. PS/2 mice connect to a PS/2 port.
  3. USB mice.

Cordless mice aren't physically connected at all. Instead they rely on infrared or radio waves to communicate with the computer. Cordless mice are more expensive than both serial and bus mice, but they do eliminate the cord, which can sometimes get in the way.

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For internet.com pages about mouse . Also check out the following links!

Related Links

Troubleshooting Mice
Discusses troubleshooting of problems with mice or related to them. This page is from "The PC Guide."

Yahoo!'s mouse page
Yahoo!'s directory of links to computer mouse manufacturers.

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related categories

Mice

Peripheral Devices

related terms

ADB

bus

bus mouse

click

cursor

double click

ergonomics

expansion board

graphical user interface

KVM switch

menu driven

pointer

serial port

trackball


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