This document classifies computers based on their size into four categories: super computers, mainframes, minicomputers, and microcomputers. Super computers are the largest and most powerful, capable of billions of instructions per second and used by large organizations for tasks like weather forecasting. Mainframes are also large and powerful, designed for large scale data processing and supporting over 100 terminals. Minicomputers are between mainframes and microcomputers in capabilities, able to support around 50 terminals. Microcomputers are the smallest, based on microprocessors, and used for personal computing like at home or small businesses.

1. Classification of
computer on the basic of
size

2. Hello!
I am Nirajan silwal
I am here because I love to give presentations.

3. SUPER COMPUTER
1

4. “
◇Super computer is the most powerful and
fastest computer among digital computer.
◇This computer is special purpose and is
capable of handling huge amount of
calculations that are beyond human
capabilities.
◇It can perform at billions of instructions
per second(BIPS).
◇Super computer has the computing
capability equal to that 40,ooo
microcomputer.

5. “
◇This computer is most expensive
computer(cost about 15-20 million dollar
range).
◇It is used only by large organization
like:NASA,UNIVERSITIES & GOVERMENT
AGENCIES, mainly in the area of defence and
weaponry, weather forecasting , satellite
communication, nuclear research etc.
◇It requires large space and temperature
controlled room.
◇Examples:NEC-500,CRAY X-MP/24 etc.

6. MAINFRAME
2

7. “
◇Mainframe is large, powerful system.
◇Although this system offers high
processing power , they lack in flexibility.
◇It is designed for large-scale data
processing.
◇It is very large in size with area of
1000sq.ft.
◇It supports large number of terminals,
more than 100 terminals.
◇It is suitable for big organization such as
bank ,insurance companies, airlines , railway
system.

8. “
Example: IBM 1401,ICL 39,and CYBER
170.IBM 1401 was the first computer
brought to Nepal.

9. MINICOMPUTER
3

10. “
◇First released in the 1960s.
◇Minicomputer got its name because of its
smaller size and cost compared to
mainframe.
◇The capabilities of a computer is
somewhere between mainframe and micro
computer. For the reason micro computer is
also called midrange computer.
◇Like mainframe , minicomputer can handle
much more input and output than
microcomputer.

11. “
◇It can support 50 terminals and requires
area of around 100 sq ft.
◇This computer is useful for small business
organizations, industries, banks, universities.
◇Example : prime 9755, HCL, CDC-1700 etc.

12. MICROCOMPUTER
4

13. “
◇A computer which is based on
microprocessor, is called microcomputer.
◇It is a small, low cost digital computer.
◇It requires small space, can be placed on
a table or even kept inside a briefcase.
◇This computer has central processing
unit on a single chip.
◇It is mainly use in office, house, school,
shop, and store.
◇Example :IBM PC,APPLE/MACINTOSH.
◇Microcomputer can be further
categorized as: non-portable & portable.

14. “
◇The microcomputer in non-portable
category can be:
1. Personal computer
2. Workstation
◇ The microcomputer in portable category
is:
• Laptop
• Notebook
• Table pc
• Palm top
• PDA(personal digital assistant).

15. “Personal computer workstation
Non-portable microcomputers

16. “ PDA PALM TOP
Portable microcomputer

17. Thanks!
Any questions?
You can find me at:
◇ Nirajansilwal4@gmail.com