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8/14/2019 Types of Computers - 1 http://slidepdf.com/reader/full/types-of-computers-1 1/18  Hardware

Types of Computers - 1

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Hardware

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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