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Lecture 05-06

Lecture 05-06

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Lecture 05-06

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  1. Computer Applications to Business Lecture 05-06 Using the Keyboard And Mouse

  2. The Keyboard • The most common input device • Must be proficient with keyboard • Skill of typing is called keyboarding

  3. The Keyboard - Standard Keyboard Layout • A standard computer keyboard has about 100 keys. • Most keyboards use the QWERTY layout, named for the first six keys in the top row of letters.

  4. The Keyboard - Standard Keyboard Layout Most keyboards have keys arranged in five groups: 1. Alphanumeric keys 2. Numeric keypad 3. Function keys 4. Modifier keys 5. Cursor-movement keys

  5. Invalid Password

  6. The Keyboard - How a Keyboard Works When you press a key: • The keyboard controller detects the keystroke. • The controller places a scan code in the keyboard buffer, indicating which key was pressed. • The keyboard sends the computer an interrupt request, telling the CPU to accept the keystroke.

  7. How the Computer Accepts Input from the Keyboard • Keyboard controller • Keyboard buffer • Scan code • Interrupt request

  8. 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

  9. The Mouse • Optical mouse • Light shown onto mouse pad • Reflection determines speed and direction • Requires little maintenance

  10. 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

  11. The Mouse • Benefits • Pointer positioning is fast • Menu interaction is easy • Users can draw electronically

  12. The Mouse • Mouse button configuration • Configured for a right-handed user • Can be reconfigured • Between 1 and 6 buttons • Extra buttons are configurable

  13. Variants of the Mouse • Trackballs • Upside down mouse • Hand rests on the ball • User moves the ball • Uses little desk space

  14. Track pads Also called touchpad Stationary pointing device Small plastic rectangle Finger moves across the pad Pointer moves with the pointer Popular on laptops Variants of the Mouse

  15. Variants of the Mouse • Track point • Little joystick on the keyboard • Move pointer by moving the joystick

  16. Ergonomics and Input Devices • Ergonomics • Study of physical relationship between human and their tools such as computers. • Concerned with physical interaction • Attempts to improve safety and comfort

  17. 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. Carpal Tunnel Syndrome

  19. 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

  20. 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