Input Devices, ContinuedMiceA mouse is an input device that allows the SYSOP to stroke functions andcommands rapidly into the computer without touching a keyboard. It alsoprovides a synchronous movement for drawing. The two types of mice arethe mechanical mouse and the optical mouse. The mechanical mouse fits inthe palm of the hand and rolls around either on a small ball or on smallwheels that roll around the ball. This movement moves the cursor on thescreen. The optical mouse also moves the cursor, but it uses a beam of lighton a reflective mouse pad. Press or click the mouse buttons to accessfunctions or commands.Figure 3-3 shows a mechanical mouse on a mouse pad. The mouse padprotects the ball inside the mouse from collecting dust from the tabletop.Figure 3-3. —A mechanical mouse.Joysticks andJoysticks and trackballs are like mice in that they allow rapid access totrackballsfunctions; however, they are most often used in game playing or contests ofskill. They resemble cockpit wheels, triggers, and guns.Continued on next page3-10
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