6. Keyboard
“A keyboard is a human interface device which
is represented as a layout of button or keys.”
It has some Features as
• Typewriter keyboard with numeric keypad
• Special purpose keys
• Toggle and combination keys
7. Definition :
“An input device used to control a pointer
on the screen.”
Mouse:
“mouse can be used to Control and manipulate
cursor movement on monitor.”
Types of Mouse :
i) Mechanical
or wireless
ii) Optical
iii) Cordless
9. Optical Input
Devices
“optical input devices that uses
light as a source of input. They
eliminate the need for manual
entry of data, thus accuracy
Scanner:
increases.
“scanners can be used to copy
the image or text on paper into a
digital format that can be used
by the computer.”
10. Other Optical Input
Devices are:
Optical scanners
Flatbed
Portable
Bar code readers:
“a barcode reader is an
electronic device which
is used for reading
printed barcodes. This
device directs a light
beam across the bar
code while it measures
11. Character and mark recognition
devices
Scanners that recognize
special characters & marks
Magnetic ink character
recognition (MICR)
Optical-character recognition
(OCR)
Optical-mark recognition (OMR)
12. Audio Input
Definition :
Devices record the analog
“audio input devices
sound and convert it into digital form for
further processing.”
Some Audio input devices are :
Voice recognition
microphone
Musical Instrument Digital
13. Video Input
Definition :
“ video input devices that can be
used to entering full motion
recording into a computer .“
Some video input devices are
digital camera
video capture
15. Monitor
Definition
“a monitor is a peripheral device which
displays computer output on a screen .
Screen output is referred to as soft
copy”
Features
Resolution-pixels
Dot pitch
Refresh rat
Size
Types of monitors
Cathode Ray Tube (CRT)
Liquid crystal Display (LCD)
16. Printer
Definition
“a printer is a peripheral device that produces a
physical copy or hard copy of the computer’s
output.”
Types of Printer :
Impact Printers
• Dot Matrix Printer
• Daisy Wheel Printer
Non Impact Printers
• Laser Printer
• Ink-Jet Printer
• Thermal Printer
17. Plotter
Definition
“a plotter is an output device
that is used to produce high
quality graphics in a variety
of colors.”
Types of Plotter
Flatbed Plotter
Drum plotter
18. Audio output
Devices
Definition
“audio output devices can be used to
translates audio information from
the computer into sounds that
people can understand.”
Common audio output devices
Speakers
Headphones
20. Computer Output Microfilm
(COM)
This technology is used to record
computer output as a microscopic
film images.
Information is recorded on a roll
of film.
COM devices are used applications
where there are large volumes of
data.
21. Combination Input and
Output Devices
Many devices combine input and output
capabilities
Fax machines
Multifunction devices
Internet telephones
Telephony
and Voice-over IP (VoIP)
known as
Terminals
22. Fax machines
Definition :
“a fax machine refers to a device or
equipment that does telephonic
transmission of scanned material.
It scans the original document and
converts it into a bitmap. It then
uses electronic signals to send the
document to another recipient. “
23. Terminals
An input and output device
Connects to a mainframe or
server
Types of terminals
Dumb terminal
Intelligent terminal
Network terminal
Internet terminal