SC3 SKILL 300-1 – Types of Computer - WordPress.com

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24 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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Classification of
computers

1. Analog

By
PRINCIPLES OF OPERATION
:

2. Digital

3. Hybrid

Analog

computers

work

on

the

principle

of

measuring
;

-

measurements

obtained

are

translated

into

data
.


ANALOG

Modern

analog

computers

usually

employ

electrical

parameters,

such

as

voltages,

resistances

or

currents,

to

represent

the

quantities

being

manipulated
.


Such

computers

do

not

deal

directly

with

the

numbers
.

They

measure

continuous

physical

magnitudes
.


-

Digital

computers

operate

with

information,

numerical

or

otherwise,

represented

in

a

digital

form
.


DIGITAL

-

Such

computers

process

data

into

a

digital

value


(in

0
s

and

1
s)
.



-

performs

calculations

and

logical

operations

with

quantities

represented

as

digits,

usually

in

the

binary

number

system

-

They

give

the

results

with

more

accuracy

and

at

a

faster

rate
.


HYBRID

-

For

computational

purposes
,

hybrid

computers

use

analog

components

and

for

storage
,

digital

memories

are

used
.

-

Hybrid

computers

incorporate

the

measuring

feature

of

an

analog

computer

and

counting

feature

of

a

digital

computer
.


1. Supercomputers

By
SIZE
:

2. Mainframes

3. Mini computers

4. Micro computers

SUPERCOMPUTERS

Used for highly calculation
intensive tasks and problems
requiring complex
calculations such as weather
forecasting, climate research,
molecular modeling, aircraft
and spacecraft designing, etc.

MAINFRAME
COMPUTERS

The chief difference between
a supercomputer and a
mainframe is that a
supercomputer channels all
its power into executing a
few programs as fast as
possible, whereas a
mainframe uses its power to
execute many programs
concurrently.

MINI COMPUTERS

In general, a minicomputer is
a multiprocessing system
capable of supporting from 4
to about 200 users
simultaneously.

MICRO COMPUTERS

A microcomputer contains a
central processing unit (CPU)
on a microchip (the
microprocessor), a memory
system , a bus system and
I/O ports, typically housed
in a motherboard.

Wearable computers

DESKTOP



A

PC

that

is

not

designed

for

portability

is

a

desktop

computer
.



Most

desktops

offer

more

power,

storage

and

versatility

for

less

cost

than

their

portable

brethren
.


DESKTOP



A

desktop

computer

is

a

personal

computer

(PC)

in

a

form

intended

for

regular

use

at

a

single

location,

as

opposed

to

a

mobile

laptop

or

portable

computer
.


LAPTOP



Laptops,

also

known

as

notebooks,

are

small
-
sized

portable

computers

can

be

placed

on

the

lap

and

used

there
.

The

display,

hard

drive,

keyboard,

memory,

processor,

and

a

trackball

or

point

device

are

integrated

in

a

battery
-
operated

package
.


LAPTOP

Advantages



Portability

-

can

be

used

in

many

place



Productivity



Connectivity



Immediacy

-

instant

access



Disadvantages



Ergonomics

and

health




Durability

-

subject

to

more

wear

and

physical

damage

than

desktops



Security


NETBOOK



Ultra
-
portable

computers

that

are

even

smaller

than

traditional

laptops
.




Cheaper

than

almost

any

brand
-
new

laptop

but,

netbooks
'

internal

components

are

less

powerful

than

those

in

regular

laptops
.

HANDHELD



A portable computer that is small enough to be held in one's
hand.



The most popular hand
-
held computers are those that are
specifically designed to provide PIM (personal information
manager) functions, such as a calendar and address book.

TABLET



A

tablet

computer,

or

simply

tablet,

is

a

one
-
piece

mobile

computer
.




Devices

typically

have

a

touchscreen,

with

finger

or

stylus

gestures

replacing

the

conventional

computer

mouse
.




Often

supplemented

by

physical

buttons

or

input

from

sensors




An

on
-
screen,

hideable

virtual

keyboard

is

usually

used

for

typing
.




Tablets

differentiate

themselves

by

being

larger

than

smart

phones

or

personal

digital

assistants
.


WORKSTATION

It

is

simply

a

desktop

computer

that

has

a

more

powerful

processor,

additional

memory

and

enhanced

capabilities

for

performing

a

special

group

of

task,

such

as

3
D

Graphics

or

game

development
.

SERVER



A

computer,

or

series

of

computers,

that

link

other

computers

or

electronic

devices

together

that

provides

data

to

other

computers
.


Serve

data

to

systems

on

a

local

area

network

(LAN)

or

a

wide

area

network

(WAN)

over

the

Internet
.




Many

types

of

servers

exist
;

web

servers,

mail

servers,

file

servers
.


SERVER



As

servers

need

stable

power

supply,

good

Internet

access,

increased

security

and

are

also

noisy,

it

is

usual

to

store

them

in

dedicated

server

centers

or

special

rooms
.




This

is

to

reduce

power

consumption

as

extra

energy

used

generates

more

heat

and

the

temperature

in

the

room

could

exceed

the

acceptable

limits
.




Normally

server

rooms

are

equipped

with

air

conditioning

devices
.



Server

casings

are

usually

flat

and

wide,

adapted

to

store

many

devices

next

to

each

other

in

server

rack
.




Unlike

ordinary

computers,

servers

usually

can

be

configured,

powered

up

and

down

or

rebooted

remotely,

using

out
-
of
-
management
.

WEARABLE COMPUTERS



Computers that are worn on the body.



This type of wearable technology has been used in behavioral
modeling, health monitoring systems, information technologies and
media development.



Especially useful for applications that require computational
support while the user's hands, voice, eyes, arms or attention are
actively engaged with the physical environment.