This document discusses different types of computers based on their size, from largest to smallest: super computers, mainframe computers, mini computers, and micro computers. Super computers are the largest and most powerful, able to perform over a trillion calculations per second and used for complex tasks like weather forecasting. Mainframe computers are also large, can support over 100 users simultaneously through terminals, and were commonly used by large organizations. Mini computers are intermediate in size, can support around 50 users, and were used by medium-sized organizations. Micro computers, the smallest, include desktops, laptops, and other portable devices, and are used by individuals.

1. Types of Computer on the basis of Size
 Super Computer
 Mainframe Computer
 Mini Computer
 Micro Computer

2. Super Computer
 super computer is physically the largest computer on size.
 fastest, most expensive and most powerful computer
 can process huge amount of data, and the fastest super
computer can perform more than one trillion calculations
per second
 can have thousands of processors
 especially made to process the complex and time consuming
calculation
 has extremely large storage capacity than other computers
 has multiples CPUs hence it supports fully parallel
processing

3. Super computer can be used for the
following applications.
 It can be used to forecast the weather and global
climate.
 It is used in military research and defense system.
 It is used in Automobile, Aircraft and Spacecraft
designing.
 It is used for encoding and decoding the sensitive
information.
 It is used in seismograph, plasma and nuclear research.
 It is used for the study of DNA and gene engineering.

4. examples of super computers are
 CRAY XT5 Jugar, IBM Roadrunner, IBM Blue
Gene/L, NEC Earth Simulator, IBM ASCI
White, IBM Deep Blue etc.

5. Mainframe Computer
 It is also large computer which covers very large area
 a general purpose computer which has been designed
for large scale data processing
 very expensive and high speed computer system
 supports large numbers of computer terminal with
separate input and output unit in each terminal so
that about 100 or more persons can work in this
computer at a time.

6. Contd…
 Time sharing technique is used to access the same computer
at the same time by multiple users.
 So mainframe computers are used in large organizations such
as insurance company and banks, where many people
frequently need to use the same data.
 In a traditional mainframe computer, each user accesses the
mainframe’s resources through a device called a terminal.
 There are two types of terminal: a dumb terminal does not
process or store data; it has simply an I/O devices and an
intelligent terminal can perform some processing operations,
but it usually does not have any storage.

7. Contd…
examples of main frame computers are
IMB1401, IBM7090, ICL2950/10 etc.

8. Mini Computer
 The computer which is smaller than Super and Mainframe
computer and larger than Micro Computer.
 It is the medium-sized computer general purpose computer
 The capabilities of a minicomputer are somewhere between
those of mainframe and personal computers.
 It’s CPU can be connected up to 50 terminals.
 about 50 persons can work in this computer at a time.
 It is used in medium size organization and corporation like
bank, insurance company, reservation center etc.
 The examples of mini computers are Prime series, AS/400,
AP-3 etc.

9. Micro Computer
 smallest general purpose computer on the basis of size
 is called micro computer because it has microprocessor for
central processing unit(CPU)
 Micro processor is a small silicon chip which is made by
integrating millions of components.
 It is also called PC because it can be used only by a single
person at a time.
 It is easy to handle so it is used in different application
areas such as schools, college, home, cyber etc.
 It is the most popular computer at present in the world.

10. Contd…
 Micro computers are of various types.
Desktop computer
Laptop computer
Notebook computer
Palmtop computer
Tablet Computer
Pocket PC
Wearable computer
The example of microcomputer are IBMPC,
Apple/Macintosh etc.