This slide is meant for Class IX CBSE.

1. DEVICES
Any machine or component that attaches to a computer.
Examples of devices include disk drives, printers, mouse
and modems. These particular devices fall into the category
of peripheral devices because they are separate from the main
computer.
Most devices, whether peripheral
or not, require a program called
a device driver that acts as a
translator, converting general
commands from an application
into specific commands that the
device understands.

2. INPUT DEVICES:
All instructions are accepted by the CPU
through electrical pulses from various
kinds of input devices. These input
devices are as old as the computers
although till date they have undergone a
lot of changes.

3. 7-3
What is Input?
• Any data or instructions used by a computer
• Input devices
– Hardware
• Keyboards
• Mouse
• Scanners
• Other devices
– Translates data into a form that the system unit
can process

4. 7-4
Keyboard Entry
• Keyboards
– Traditional keyboards
• Flexible keyboards
• Ergonomic keyboards
• Wireless keyboards
• PDA keyboards
– Features
• Typewriter keyboard with numeric pad
• Special purpose keys
• Toggle and combination keys

5. PDA(personal digital assistant) key board
Ergonomics keyboard:
For personal comfortable
Traditional keyboard

6. TOUCH PAD
JOY STICK
MAGNETIC INK CRACTER READER

7. 7-7
Pointing Devices
• Mouse
– Mechanical
Optical
CORDLESS / WIRESS LESS MOUSE

8. 7-8
OPTICAL CHARACTER READER
BARCODE READER
SCANNER

9. 7-9
Image Capturing Devices
• Digital camera
– Images recorded digitally on a disk
– Images can be downloaded to a computer
• Digital video camera
– Records motion digitally
– Can take still images as well
– WebCams
• Specialized digital video cameras
• Broadcast images over the Internet

10. 7-10
Digitizing Devices
• Graphics Tablets
• Digital Notepads

11. 7-11
Audio Input Devices
• Voice
– Voice recognition systems
• Discrete-speech recognition systems
• Continuous-speech recognition system
– Music
• Musical Interface Digital Interface (MIDI)

12. 7-12
What is Output?
• Processed data or information
• Types of output
– Text
– Graphics
– Audio & video
• Output devices
– Monitors
– Printers

13. 7-13
Monitors
• Known as screens or display screens
• Output referred to as soft copy
• Features
– Resolution
– Dot pitch
– Refresh rate
– Size

14. 7-14
Monitors
CATHOD RAY TUBE
MONITOR
(LCD)
LIQUID CRYSTAL
DISPLAY MONITOR

15. 7-15
Printers
• Translates information that has been
processed by the system unit
• Output referred to as hard copy
• Features
– Resolution
– Color capability
– Speed
– Memory

16. 7-16
Printers
INKJET PRINTERS
DOTMATRIX PRINTERS
LAZER PRINTERS

17. 7-17
Audio Output Devices
• Translates audio information into sounds that
people can understand
• Common devices
– Speakers
– Headphones

18. STORAGE DEVICES
PUNCHING DEVICE
AND CARD