-Any data or instruction used by a computer.
(computing essentials McGraw-Hill)
-information fed into a data processing system or
-what is put in, taken in, or operated on by any
process or system. (Google.com)
Hardware to translate words, sounds,
images, and actions that people
understand into a form that system
unit can process.
Eg: pointing devices, scanning, imagecapturing, and audio-input devices.
Converts numbers, letters and special
characters that people understand into
These signals are sent, processed in
the system unit.
Mostly are QWERTY types keyboard.
TRADITIONAL KEYBOARDS: full sized,
rigid, rectangular keyboards. Include
functions, navigational & numeric keys
ERGONOMICS: = as traditional. But the
arrangement of keyboard is not rectangular
and has palm rests. Designed to reduce
WIRELESS: self-explained. Transmit input
to the system by air.
PDA: keyboards for PDA’s and
VIRTUAL: image of keyboards on a touch
screen. Screens function as the actual input
Combines a typewriter with a numeric keypad
Used to enter numbers, and arithmetic symbols
Also have many special purpose keys.
(eg: toggle keys, f(x) keys, esc, navi, etc.)
Pr0vide intuitive interface with system
unit by accepting pointing gestures
and converting them into machinereadable input.
Controls a pointer that is displayed on
Can have one, two or more buttons.
OPTICAL: has no moving parts and most
widely used. Emits and senses light to
detect mouse movements.
MECHANICAL: has a ball on the bottom.
Roller rotates and pointer moves on screen.
CORDLESS: battery powered. Uses
radio/infrared light waves to transmit input
to system unit.
DEVICES = MOUSE
TRACKBALL: a.k.a the roller ball.
TOUCH PADS: control pointer by moving
and tapping fingers on touch pads.
POINTING STICKS: located in middle of
the keyboard. Controls pointers by directing
TOUCH SCREENS: allows user to make
interface using fingers or pen like devices.
MULTITOUCH SCREENS: can be touched
by more than one fingers. Enables
interfaces such as rotating or zooming.
JOYSTICKS: popular with PC games.
Varying pressure, speed and directions of
the joysticks to control game actions.
STYLUS: pen like devices. Uses pressure
to draw images on screens. Handwriting
recognition devices translates handwritten
notes into computer input.
Move across text and images.
Convert scanned text and image to a
form that system unit can process.
Known simply as scanner, accepts documents
consisting as text and/or images
Converts them to machine-readable form.
Do not recognize individual letters or images BUT
recognize light, dark and colored areas that made
up the the individual letters or images.
The files saved can be further modified.
FLATBED: similar to copy machines. Image
scanned on glass surface and scanner
recors image from below.
DOCUMENT: similar to flatbed only that it
can quickly scan multiple documents.
Automaticly feeds one page of a document
at a time through a scanning surface.
PORTABLE: self explained.
Card readers interprets information stored
MAGNETIC: encoded information stored on
a thin magnetic strip on the back of the
RADIO FREQUENCY: this cards have
RFID (radio frequency identification)
microchip that contains user’s encoded
BAR CODE READERS
Either handheld or platform scanners.
Contain photoelectric cells that scan or
reads bar codes. IIIIIIIIIII
Almost all supermarkets and cash registers
uses UPC (universal product code).
Read – supermarket’s computer (stores
description, latest price and inventory) –
process – update – provide cash registers
with description and price for each product.
CHARACTER AND MARK
Scanners that are able to recognize
special characters and marks. Only
specific for specific applications.
RECOGNITION(MICR): used by banks to read
unusual numbers at the bottom of the checks and
deposit slips. Read by reader/sorter and provides
uses special preprinted characters that can be
read by alight source and changed into machine
OPTICAL-MARK RECOGNITION(OMR): senses
the presence or absence of mark, such as pencil
Create or capture original images.
DIGITAL CAMERA: image are recorded digitally
on disk or in memory rather than film.
DIGITAL VIDEO CAMERAS: record motion
digitally on disks or in memory. Most can take still
image as well. Webcams are specialized digital
video that captures image and send the to
computers for broadcast.
AUDIO INPUT DEVICES
Convert sound to a form that system unit can
process. Mostly used is the microphone.
VOICE RECOGNITION SYSTEM: uses a mic,
a sound card, a special software.
This allows users to operate computers and
other devices and create documents using
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