Intro Ch 03 A
- 1. McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
- 2. Chapter 3A Using the Keyboard And Mouse
- 3. The Keyboard The most common input device Must be proficient with keyboard Skill is called keyboarding
- 4. The Keyboard How keyboard works Keyboard controller detects a key press Controller sends a code to the CPU Code represents the key pressed Controller notifies the operating system Operating system responds Controller repeats the letter if held
- 5. The Mouse All modern computers have a variant Allows users to select objects Pointer moved by the mouse Mechanical mouse Rubber ball determines direction and speed The ball often requires cleaning
- 6. The Mouse Optical mouse Light shown onto mouse pad Reflection determines speed and direction Requires little maintenance
- 7. The Mouse Interacting with a mouse Actions involve pointing to an object Clicking selects the object Clicking and holding drags the object Releasing an object is a drop Right clicking activates the shortcut menu Modern mice include a scroll wheel
- 8. The Mouse Benefits Pointer positioning is fast Menu interaction is easy Users can draw electronically
- 9. The Mouse Mouse button configuration Configured for a right-handed user Can be reconfigured Between 1 and 6 buttons Extra buttons are configurable
- 10. Variants of the Mouse Trackballs Upside down mouse Hand rests on the ball User moves the ball Uses little desk space
- 11. Variants of the Mouse Track pads Stationary pointing device Small plastic rectangle Finger moves across the pad Pointer moves with the pointer Popular on laptops
- 12. Variants of the Mouse Track point Little joystick on the keyboard Move pointer by moving the joystick
- 13. Ergonomics and Input Devices Ergonomics Study of human and tool interaction Concerned with physical interaction Attempts to improve safety and comfort
- 14. Ergonomics and Input Devices Repetitive Strain Injury (RSI) Caused by continuous misuse of the body Many professions suffer from RSI Carpal Tunnel Syndrome Carpal tunnel is a passage in the wrist Holds nerves and tendons Prolonged keyboarding swells tendons
- 16. Ergonomics and Input Devices Office hardware suggestions Office chairs should have Adjustable armrests and height Armrests Lower back support Desks should have Have a keyboard tray Keep hands at keyboard height Place the monitor at eye level
- 17. Ergonomics and Input Devices Techniques to avoid RSI Sit up straight Have a padded wrist support Keep your arms straight Keyboard properly Take frequent breaks
- 18. Chapter 3A End of Chapter