1. Presentation of Input & Output Devices
Prepared by
Bernard, Angela & Vivian

2. Input & Output Devices
Tools for people to interact & communicate with computers.
Enter data using input devices
Computer give us back the results through output devices

3. Input Devices
Any hardware component that allows the user to enter data, programs, commands, and user response to a computer

4. Traditional Input Devices
Keyboards
Point-and-Draw Devices

5. Keyboards – the most commonly used input device
Keys for letters of
alphabet, numbers
12 Function keys
Arrow Keys
Additional keys
Status lights

6. Point-and-Draw Devices – allow the user to control the pointer on the screen
Mouse – 2/3 buttons & a ball underneath
Ball underneath detects movements 
Send signals to computer 
Instructor the mouse pointer on the screen
to move accordingly

7. Point-and-Draw Devices
Trackball
Joystick
Digitizer Tablet and Pen
Trackpad
Trackpoint

8. Scanners and Reading Devices
Capture data directly from the source document
The input process becomes more efficient because manual data entry is eliminated

9. Optical Scanners A light sensing input device
Reads printed text & graphics
Results are stored in rows & columns of dots called a BITMAP
Files containing the scanned object can be printed, sent via

10. 3 Basic Scanner Categories (OCR and Bar codes)
Handheld label scanners
Stationary label scanners
Document scanners
Wand scanners
Can use contact or laser technology
Common in grocery stores
Use laser technology only
Can scan documents of various sizes

11. Data Collection Devices - Digital Cameras
quality is measured by resolution

12. Audio & Video Input Audio input Video input
Recording music, speech, or sound effects
Speech recognition
Video input
Entering full-motion recording into a computer & storing the video on a hard disk or other medium

13. What is Output ? Text, graphic, audio, video
Data that has been processed into a useful form called information
Text, graphic, audio, video

14. Output Devices - any component capable of conveying information to a user
Monitors
Printers
Multimedia Projectors
Voice - Response Systems

15. Display Devices – visually displays soft copies of text, graphics, and video information
Color monitor: displays text, graphics and video information in color
Monochrome monitor: display text, graphics and video information in one color

16. Printers Produce hard copies (printouts) of text, graphics…
Print with portrait or landscape
Impact Printers or Nonimpact Printers

17. Impact Printers
Form characters & graphics by striking a mechanism against an ink ribbon that contacts the paper
Withstand dusty environments, vibrations, & extreme temp.
E.g. dot-matrix printers

18. Dot Matrix Printers
It creates dots that form characters & graphics when tiny pins strike an inked ribbon
50 to 700 characters/sec (cps)

19. Nonimpact Printers No striking mechanism Quiet High-Quality output
Colour
Single Sheets
E.g. Ink-jet printers, laser printers, thermal printers, portable printers, label printers

20. Laser Printers/Page Printers
High speed, high quality
600 dpi to 1200 dpi
Have memory, store entire page before printing  sometimes are called page printers

21. Ink-jet Printers 600 dpi and up Inexpensive for color abilities
Forms characters & graphics by spraying tiny drops of liquid ink onto a piece of paper

22. Portable Printers A small, lightweight printer
Allows a mobile user to print from a laptop or handheld computer

23. Thermal Printers Inexpensive;
Low printing quality, images fade over time
Produce high-quality drawings such as blueprints, maps,etc.

24. Other Output Devices Presentation Graphics Voice-Response Systems
LCD Panels
LCD Projectors
Voice-Response Systems
Speakers
Headsets
Fax Machine

25. Terminals function as both input & output devices Consist of:
A monitor (output)
A keyboard (input)
A video card

26. Terminals Basic categories of terminals: Dumb terminals
No independent processing power
Are used to enter & transmit data to, or receive & display information from the host computer
Intelligent terminals
Has memory & processor
Independent processing capability

27. Point-of-sale (POS) terminal:
Are used to record purchases at the point where consumer purchases the product/service
Used in grocery store, e.g. electronic cash register, bar code reader
Automatic teller machine (ATM):
A self-service banking machine attached to a host computer through a telephone network.
Touch screens, e.g. withdraw cash, deposit money, transfer funds, inquire A/C balance

28. End of Presentation
Thank You