Intro_Ch_03A.pdf
- 1. Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Technology Education Chapter 3A Using the Keyboard And Mouse
- 2. 3A-2 The Keyboard • The most common input device – Must be proficient/capable with keyboard – Skill is called keyboarding – Keyboarding Skills-- the ability to input information at a keyboard smoothly while typing.
- 3. 3A-3 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
- 4. 3A-4 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
- 5. 3A-5 The Mouse • Optical mouse – Light shown onto mouse pad – Reflection determines speed and direction – Requires little maintenance
- 6. 3A-6 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
- 10. 3A-10 The Mouse • Benefits – Pointer positioning is fast – Menu interaction is easy – Users can draw electronically • Example (Paint)
- 11. 3A-11 The Mouse • Mouse button configuration – Configured for a right-handed user
- 12. 3A-12 Variants of the Mouse • Trackballs – Upside down mouse – Hand rests on the ball – User moves the ball – Uses little desk space
- 13. 3A-13 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
- 14. 3A-14 Variants of the Mouse • Track point – Little joystick on the keyboard – Move pointer by moving the joystick
- 15. 3A-15 Ergonomics and Input Devices • Ergonomics – Study of human and tool interaction – Concerned with physical interaction – Attempts to improve safety and comfort
- 16. 3A-16 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
- 18. 3A-18 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
- 19. 3A-19 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
- 20. Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Technology Education Chapter 3A End of Chapter