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TitleComputer Notes for 9th Class
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Page 17

Written by: Maryem Javed (Computer and Math’s teacher)

The Educators School Kasur Campus

E-mail: [email protected]

Computer Notes for 9
th

Class (Unit 1)

17

17



2. Special Purpose Computers



A computer designed for machine control or process control would be

different than a general purpose computer. The special purpose computers

are designed to solve specific problems. The computer program for solving a

specific problem is built right into the computer. Most analog computers are

special purpose computers. These special purpose computers are widely used

in industrial robotics.

Q14: Write down the Classification of Computers According to Size.

Ans: Classification According to Size:

Computers are classified according to sizes, speed and memory capacity.

Computers are of different types:

1. SUPER COMPUTERS

Super computer are the largest, fastest and the most expensive computer

systems in the world. They are used to process complex scientific jobs.

These computers are very expensive and the speed is measured in billions

of instructions per seconds. Supercomputers are manufactured using

thousands of processors. Its size is equal to full room. These computers are

used in Applications in medicine, Aerospace, Online banking and weather

forecasting etc.

There are very few companies in the world produce super computers.

 Cary research and

 ETA system Inc.

are two primary manufactures of super computers in United States.

 Fujitsu

Page 18

Written by: Maryem Javed (Computer and Math’s teacher)

The Educators School Kasur Campus

E-mail: [email protected]

Computer Notes for 9
th

Class (Unit 1)

18

18



 Hitachi

 NEC

These are the companies in Japan, which produce super computers.

Famous supercomputers are:

 Cray-1

 Cray-2

 Cray-3

 Cray XMP

 ETA-10

2. MAINFRAME COMPUTERS

Mainframe computers are large, expensive and very powerful computers that can

handle hundreds or thousands of connected users simultaneously. These

computers are capable of processing data at very high speed, millions of

instructions per second and have access to billions of characters of data. The size

of Mainframe is equal to door size or half room size. Mainframes store large

amounts of data, instructions and information. Many people can make use of the

same machine at the same time. These computers are used in banks, educational

institutions, insurance companies and airlines etc. Mainframes are manufactured

by IBM (International Business Machine), NEC (National Electronics

Corporation), HP (Hewlett Packard). Following are the different models of

Mainframe Computers available in the market:

 Mark I

 Whirlwind

 IBM 701

 IBM 360

Page 34

Written by: Maryem Javed (Computer and Math’s teacher)

The Educators School Kasur Campus

E-mail: [email protected]

Computer Notes for 9
th

Class (Unit 1)

34

34

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