1. Input and Output
Gina 10A

2. Input
Input devices allow us to enter raw data into a computer.
The computer processes the data and then produces
outputs that we can understand using an output device.
The processing is mainly handled by the CPU.
2 types of Input:
 Manual
 Automatic

3. Manual Input Devices

4. Keyboard
 Made up of buttons,
“Keys”.
 “QWERTY” is another
word for keyboard.
Come from the first 6
letters on the top row of
the alphabet keys.

5. Alphanumeric Keyboard
 Allows:
 text (abc…)
 number (123…)
 Symbols (@#$...)

6. Numeric Keypad
 Small keyboard
 Only have numbers
 Enter numeric data
into ATM

7. PIN Pad
 Enter Personal
Identity Number (PIN)
 Electronic door locks.

8. Mouse
 Pointing device
 Sensors on the bottom of
the mouse detect when
the mouse is moved.
 Optical or wireless
technology to track mouse
movement.
 control by GUI

9. Touchpad/Trackpad
 On laptops
 Take up less space
 Use by fingers
 Control by GUI

10. Trackball/Tracker Ball
 Pointing device
 Large ball that user
spins.
 Control by GUI pointer
 Limited movement
(disabled)
 Very young, easier to
use than a mouse

11. Touch screen
 Touching the surface
 Very intuitive and
simple to use.
 Information
terminals in public
places e.g museums.

12. Graphics Tablet
 Pointing device
 Used by designers and
artists.
 Allows natural hand
movements.
 Input to graphics
application.
 Hand-drawn sketches

13. Joystick/ Joypad
 Playing games
 Small joysticks can be
found on some mobile
phones.

14. Light Pen
 Pointing device
 Write on screen
 Rarely used

15. Scanner
 Scans images, etc.
 Taking close-up photograph
 Most common scanner is
Flat-bed.

16. Digital Camera
 Digital photographs
 Store on memory cards.
 Transferred to a computer.
 10 Megapixels

17. Video Camera
 Stored on video-tape or
memory cards.
 Later transferred to a
computer.
 Television production

18. Web Cam
 Very basic video camera
 Live video into computer
 Low quality
 For web chats

19. Microphone
 Converts sound into a signal
 Analogue
 ADC: Analogue Digital
Convertor

20. Automatic Input Devices

21. Magnetic Strip Reader
 Strip of material that can be
magnetised on the back.
 Data stored in the form of
magnetised dots.
 Data stored on the strip
 Data shown on the front of
the card.
 Faster and more accurately
 Swiping the card through a slot.

22. Smart Card/Chip Reader
 Chip of computer memory
 Smart cards
 Data stored in this memory
and read back using a chip
reader.
 Connect to metal pads
 The reader can access the
memory chip and data
stored.

23. MICR Reader
 Magnetic Ink Character
Recognition
 Bank cheques
 Quickly & accurately
 Cheque number & bank
account number are printed at
the bottom of the bank cheque.
 Special magnetic Ink, special
front
 MICR reader

24. OMR Scanner
 Optical Mark Recognition
 read quickly & accurately
 Special OMR forms can be
coloured in.
 Marks then detected by OMR
scanner.
 Multiple-choice exam answer
sheets & lottery number
forms.

25. OCR Scanner
 Optical Character
recognition
 Convert images of text into
an actual text file
 Scanned, scanned image
then analysed by OCR
software.
 Letter shapes
 handwriting or handwriting
recognition

26. Barcode Reader/Scanner
 Numeric code
 Series of lines
 Barcode reader/scanner
 Point-of-Scale (POS)
 Code
 Read barcode, quick & accurate
than typing.

27. Sensors
 Senses (5 senses)
 Converts a real-world
property into data that
computer can process.
 Analogue signal converted into
digital data for computer.
 Analogue-to-Digital-
Converter (ADC)
 Use:
monitoring, measuring, data
logging systems & computer
control systems.

28. Remote Control
 Send data signal by
button.
 Infrared light or radio
signals
 Control a computer from
some distance.
 Control a presentation
slideshow.

29. Output

30. CRT Monitor
 Displays text & image
 Cathode-ray tube (CRT)
 Large & boxy
 A lot of desk space.
 Replaced by flat-screen
monitors.
 Accuracy & brightness

31. Flat-Screen Monitor (TFT or
LCD)
 Replaced CRT monitors
 Light in weight
 Little desk space
 Picture quality

32. Digital/Multimedia Projector
 Very large viewing area
e.g.: presentations for
advertising or watching
movies.
 DVD player
 Satellite receiver
 Powerful light source

33. Loudspeaker
 Music or sounds
 Convert electrical signals
into sound waves
 Music editing, video
conferencing, watching
movie.

34. Dot Matrix Printer
 Tiny pins
 Leaves a pattern of dots. Can form
letters, images, etc.
 Continuous stationary
 Quality is poor
 Noisy
 Carbon-copies e.g. airline
tickets
 Duplicate pages all printed in one
go.
 Very cheap
 Last for a long time e.g. shop
receipts.

35. InkJet Printer
 Cheap, High-quality
 Full-colour
 Squirts tiny droplets
 Full-colour
 Tiny holes: jets
 Perfect for photographs
 Very quite
 Cheap to manufacture
 Ink is very expensive
 Expensive to use

36. Laser Printer
 Very complex
 Expensive to buy
 Very cheap to use
 Marks on paper >> toner
 Complex system, laser
 Very fast printing
 Very common use in offices

37. Plotter
 Draw on paper using a pen
 Accurately & quickly
 Different coloured pens
 Used by designers &
architects
 Huge pieces of paper

38. Motor
 Movement
 In washing machine,
microwave & air conditioning
units.
 Switched on & off

39. Pumps
 Push water
 Air along pipes
 Part of watering systems
in greenhouses, in
factories.

40. Buzzer
 Provide noise
 In microwave oven
 Louder noise in siren or
electric bell, e.g. burger
alarm system.

41. Lights
 Light bulbs
 LEDs
 Provide lights or indicate
something.
 E.g. traffic lights, in car
dashboards

42. Heater/Cooler
 Provide heat
 Cool things down
 Keep a room or a
greenhouse at correct
temperature.
 Cooling unit
 Keep food fresh