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8/14/2019 Types of Computers - 1
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Hardware
8/14/2019 Types of Computers - 1
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Types of computers - 1
STAND ALONE
DESKTOP
PC
HOME COMPUTER
MINI
COMPUTER
Very powerful,
used for specialisttasks, or uses.
MAINFRAME
Used by large companies.
These will take up a
whole room, and may not
need people in the room.
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Types of computers - 2
STAND ALONE
DESKTOP
PC
HOME COMPUTER
LAPTOP
Just as powerful as
as PC but can run
on batteries (for 3
to 4 hours only).
PALMTOP
Very small, but less powerful, computers.
Can be carried in a
pocket anywhere.
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Types of computers - 3
LAN (Local Area Network)
A number of computers
connected to a server which
holds all the software.
Usually in one building/room.
WAN (Wide Area Network)
These computers are connected
together across: buildings,
counties or even countries. The
Internet is the biggest WAN.
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Input devices - 1KEYBOARD
Typing information into any
software:
•Word processor
•DTP
TOUCH SENSITIVE SCREEN
To select options from the screen by touch.
Or for the physically disabled
who cannot use a mouse.
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Input devices - 2
MOUSE To selects menu
options or to
draw with
GRAPHICS TABLET
to enable you to draw
freehand into thecomputer
MICROPHONE To enable you to talk
directly into a word
processor (good for
the dyslexic or the
disabled to use).
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Input devices - 3
BAR CODE SCANNER
To scan in bar codes insupermarkets, or other
shops. This version is
hand held.
MAGNETIC STRIP(E)
READER
These are usually built
into POS tills at shops and
supermarket to make
payments using cards.
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Input devices - 4
DIGITAL CAMERA
To take photographs whichcan be fed directly into the
computer
SCANNER
To copy photographs,
pictures, text from
books / magazines, intothe computer.
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Input devices - 5
MICR READER
The ink is magnetised
before reading. Very
reliable so used on
cheques.
OCR READER
This reads normal
text. Most home
scanners can do this
OMR READER This will read marks
on a page. Used for
school registers and
multiple choice tests.
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Output devices 1
MONITOR, VDU
To allow you to see
what is happening,
or what you have
typed.
LASER
PRINTER
For fast highquality output.
COLOUR PRINTER For
slower prints in
full colour.
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Output devices - 2
DATA
PROJECTOR
To show what is
on the monitor
screen to large
audiences.
SPEAKERS
To listen to
music, language,or commentary.
HEADPHONES
Just like speakers
but the noise does
not distract others
in the same room.
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Output devices -3PLOTTER
For producing
technical drawings
and maps
CUTTER
For cutting out
designs in: steel,
plastic or wood.
MILLING MACHINE
To cut out shapes and
holes using a drill
(as in room 24).
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Output devices - 4
LIGHTS can be used as
output devices in computer control. Examples are:
•Disco lights
•Burglar alarms
MOTORS can be used as
output devices in computer
control. Examples are:
•Washing machines
•Burglar alarms
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Storage devices - 1
FLOPPY
DISK DRIVE
used to storesmall amounts
of data
HARD DRIVE used to store
large amounts
of data (fixed).
CDROM
DRIVE (DVD)
used to storemedium amounts
of data
ZIP DRIVE used to store
medium amounts
of data
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Storage devices - 2
ON-LINE STORAGE
Free 30Mb with Yahoo
just click on “Briefcase”.
Access your files from
anywhere in the world.
PAPER Paper is not a device,
but counts as one
method of permanently
storing data.
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Communication devices - 1
DIGITAL
computer signals
ANALOGUE
phone line signals
MODEM converts or
changes digital signals
into analogue signals
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Communication devices - 2
FAX
MACHINE
Used for sending:
letters, documents
or pictures
instantaneously toa second FAX.
Internet is not
needed, just a
phone line.
How to send a FAX:
•Put in letter
•Dial FAX number
•Wait for the beeps
•Press SEND
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Hardware Summary
Types of
computers
•Main/mini/micro
•Laptop/palmtop
Input devices
•Send information
into the computer
Output devices
•Receive
information from
the computer
Storage devices
•Keep information
for use later
•You output to it
and input from it
Comms devices
•Modems convert
digital signals into
analogue signals
•And visa versa