1.Input/Output Devices

2. Keyboard 08/21/10 PCTE, Baddowal 3. 2 button Mouse with scroll wheel 08/21/10 PCTE, Baddowal 4. 2 Button Mouse with scroll wheel

A ball in the bottom of the mouse rolls on the surface as you move the mouse.

Internal rollers sense the ball movement and transmit the information to computer via the cord of the mouse.

If the ball is dirty, mouse does not roll smoothly.

08/21/10 PCTE, Baddowal 5. Optical Mouse 08/21/10 PCTE, Baddowal 6. Optical Mouse

Does not use rolling ball.

Uses light and a small optical sensor, which detects the motion of the mouse.

Problem of dirty mouse ball is avoided by using optical mouse.

08/21/10 PCTE, Baddowal 7. Wireless Mouse 08/21/10 PCTE, Baddowal 8. Wireless Mouse

Communicates through Bluetooth mostly.

Needs external batteries.

08/21/10 PCTE, Baddowal 9. Touchpad of a Laptop Computer 08/21/10 PCTE, Baddowal 10. Touchpad

Itsa pointing device.

It consists of a special surface which translates the motion & position of users fingers to a relative position on the screen.

Commonly used in laptops as a substitute for a mouse.

Also used in PDAs.

08/21/10 PCTE, Baddowal 11. Touchscreen

Most simple, intuitive, and easiest to learn of all input devices.

Enables users to choose from available options by simply touching with their finger the desired icon or menu item displayed on the screen.

08/21/10 PCTE, Baddowal 12. Touchscreen

Most preferred human-computer interface used ininformation kiosks and ATMs.

08/21/10 PCTE, Baddowal 13. Mobile with Touch screen and QWERTY keyboard 08/21/10 PCTE, Baddowal 14. Touch screen ATM 08/21/10 PCTE, Baddowal 15. Trackpoint 08/21/10 PCTE, Baddowal 16. Trackball Mouse 08/21/10 PCTE, Baddowal 17. Trackball in a laptop 08/21/10 PCTE, Baddowal 18. Joystick 08/21/10 PCTE, Baddowal 19. Light Pen 08/21/10 PCTE, Baddowal