cs100 lec 3 (hardware input & output )
TRANSCRIPT
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
1/35
Hardware Components
Input Devices
Output Devices
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
2/35
Input Devices - Consist devices that translate data into a
form the computer can process
Keyboard
is a device that converts letters, numbers, and other characters into electrical signals that can be read by the
computers processor.
2 types
1. Traditional computer keyboard (104 - 105 keys)
2. Specialty keyboards and terminals (touch tone
telephone keypads to keyboards featuring pictures of food
for use in fast-food restaurants
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
3/35
TRADITIONAL KEYBOARD SPECIALTY KEYBOARD
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
4/35
Pointing devices
Control the position of the cursor or pointer on the screen
1. mouse and its variants:
small, hand-held device is used to move the cursor to a specific location on the screen
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
5/35
trackball a movable
ball, mounted on topof a stationary device,
that can be rotated
using your fingers or
palm
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
6/35
pointing stick
looks like a pencileraser protruding
from the keyboard
between G, H, and B
keys
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
7/35
touch pad a small,
flat surface over which you slide your
finger
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
8/35
2. touch screen a video display screen that has been
sensitized to received input from the touch of a finger
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
9/35
3. Pen Input:
Pen-based computer system
allows users to enter handwriting and mark onto acomputer screen by means ofa penlike stylus rather thantyping on a keyboard (ex.handheld and digital notebook)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
10/35
Light pen a light-sensitive
penlike device connected by a
wire to the computer terminal
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
11/35
Digitizer uses a mouselike
copying device called a puck,
or an electronic pen, whichcan convert drawings and
photos to digital data. (ex.
digitizing tablet)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
12/35
Source Data-Entry Devices
Data are entered directly from the source. It creates machine-readable
data on magnetic media or paper or feed it directly into the computers
processor
1. Scanning devices.Scanners use light-
sensing equipment to
translate images of text,
drawings, photos, and
the like into digital forms.
a. Imaging System
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
13/35
b. Bar-code reader
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
14/35
c. Mark-recognition and Character-recognition devices.
c.1 Magnetic-ink character recognition (MICR)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
15/35
c.2 Optical-mark recognition (OMR)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
16/35
c.3Optical-character recognition (OCR)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
17/35
d. Fax machines
d.1 Dedicated fax machinesd.2 Fax modem
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
18/35
Source Data-Entry Devices2. Webcam a camera that attaches to a computer to record moving images that can
then be posted on a website in real time
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
19/35
3. Digital cameras electronic camera that uses a light-sensitive processor
chip to capture photographic images in digital form on a small diskette
inserted in the camera or on flash-memory chip.
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
20/35
4. Human biology-input devices.
Characteristics and movements of
the human body, when interpreted by
sensors, optical scanners, voicerecognition, and other technologies,
can be form of input.
a. Biometric system.
b. Line of sight systems
VOICE
RECOGNITION
FINGER SCANNER
HAND SCANNER
EYE SCANNER
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
21/35
Output Devices
Consists of devices that convert machine-readable
information, obtained as a result of processing, into people-readable form
2 types
1. Softcopy data that is shown on a display screen or is in audio
or voice form
2. Hardcopy printed output
Other Outputs
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
22/35
Softcopy a. Display screen also called as monitors
2 Types
a.1 Cathode-Ray Tube (CRT)- is a vacuum tube used as a display
screen in a computer or video display terminal
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
23/35
a.2 Flat-panel displaysare made up of two platesof glass separated by alayer of a substance inwhich light is manipulated(ex. Liquid crystal display(LCD)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
24/35
Hardcopy
a. Impact Printer- forms characters or images by striking a mechanism such as a printhammer or wheel against an inked ribbon. (ex. Dot matrix)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
25/35
b. Nonimpact Printers form characters and
images without direct physical contact
between the printing mechanism and
paper.
3 Types
b.1 Laser Printer
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
26/35
b.2 Ink-jet Printer
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
27/35
b.3 Bubble-jet Printer
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
28/35
b.4 Thermal Printer
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
29/35
c. Plotters.
3 Types
c.1 Pen
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
30/35
c.2 Electrostatic
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
31/35
c.3 Large-format
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
32/35
d. Multifunction
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
33/35
Other Output: Sound, Voice, and Video
1. Sound Output devices produce digitized sounds, ranging from beeps
and chirps to music. (ex. speaker)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
34/35
2. Voice Output Devices convert digital data into speech-like
sounds. (ex. in telephone answering machine, cars, toys and games)
-
8/8/2019 Cs100 Lec 3 (Hardware Input & Output )
35/35
3. Video Output video consists of photographic images, which are playedat 15-29 frames per second to give the appearance of full motion.