Input & Output Devices

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

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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
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Input Devices
Any hardware component that allows the
user to enter data, programs, commands,
and user response to a computer
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4.

Traditional Input Devices
Keyboards
Point-and-Draw Devices
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Keyboards – the most
commonly used input device
• Keys for letters of
alphabet, numbers
• 12 Function keys
• Arrow Keys
• Additional keys
• Status lights
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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
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Point-and-Draw Devices
Joystick
Trackball
Digitizer
Tablet and Pen
Trackpoint
Trackpad
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8.

Scanners and Reading Devices
Capture data directly from the source
document
The input process becomes more
efficient because manual data entry is
eliminated
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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 e-mail
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3 Basic Scanner Categories
(OCR and Bar codes)
Handheld label
scanners
Stationary label
Document scanners
scanners
Common in
Can use contact grocery stores
or laser technology Use laser
technology only
Wand scanners
Can scan
documents of
various sizes
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11.

Data Collection Devices Digital Cameras
quality is measured by resolution
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12.

Audio & Video Input
Audio 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
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What is Output ?
Data that has been processed into a
useful form called information
Text, graphic, audio, video
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Output Devices - any component
capable of conveying information to a
user
Monitors
Printers
Multimedia Projectors
Voice - Response Systems
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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
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Printers
•Produce hard copies (printouts) of text,
graphics…
•Print with portrait or landscape
•Impact Printers or Nonimpact Printers
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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
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Dot Matrix Printers
• It creates dots that form
characters & graphics
when tiny pins strike an
inked ribbon
• 50 to 700 characters/sec
(cps)
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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
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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
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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
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Portable Printers
• A small, lightweight printer
• Allows a mobile user to
print from a laptop or
handheld computer
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Thermal Printers
• Inexpensive;
• Low printing quality,
images fade over time
• Produce high-quality
drawings such as
blueprints, maps,etc.
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Other Output Devices
Presentation Graphics
– LCD Panels
– LCD Projectors
Voice-Response Systems
– Speakers
– Headsets
Fax Machine
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25.

Terminals
function as both input & output devices
Consist of:
– A monitor (output)
– A keyboard (input)
– A video card
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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
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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
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End of Presentation
Thank You
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