Analog Computer

Hybrid Computer

Digital Computer

In this computer represents data as numbers or separate unit’s.

Digital computer operates an decimal digits that represents either discreat data or symbols.

It takes input and give output in the form of numbers, letters and special characters.

This type computers are generally used for business and scientific data processing and also had a unique ability that is storing large quantities of data.

In this computer magnetic media is used as storage device.

This type of computer represents number by a physical quantity that is they assign numeric values by physically measuring some actual property, such as the length of an object, an angle created by two lines or the amount of voltage passing through a point in an electric circuit.

Analog computer derive all their data from some of measurement.

Though effective for some applications this method of representing number is a limitations of the analog computer.

The accuracy of the data used in an analog computer is directly related to the precision of its measurement

Hybrid computer combine the most desirable feature

of both analog and digital computer.

They have the speed of Analog Computer and the

accuracy of Digital Computer.

They usually used the special problems in which

input data derived from measurements is converted

in to digits and processed by computers.

Main frame Computer

Mini Computer

Micro Computer

Super Computer

Faster than Mini Computer and have larger memory

used in CPU intensive or I/O intensive job,like

In scientific and business applications and to

process high volume of data in large business

applications..

Example-IBM-370 and IBM-S/390,

DEC VAX-8800,

CPC-7600, UNIVAC-1110

Relatively faster and low cost compared to mainframes,

higher than PCs.

Design for real time dedicated multi user applications.

Example-IBM-17,

HP-3000

DECPDP-11

Slow, cheap significant computing power.

Use of INTEL chips. Single processor system

which can supports the simple tasks like

WP,ESS,DBMS etc

Example-PS 386, 486

PENTIUM (P-1, 2 ,3, 4)

Large in size and large memory compared to all other computers.

Ideal for high end computing applications involving large volume of data and intensive computing use-INTEL chips.

These computers are design for ultra high performance tasks such as encryption, cracking, creation of animation and for designing all knowledge based systems.

Example- IBMs Deep Blue,

CDC cyber family and

CRAY X-mp/26

Internet

IT Books of SMU