3. Classification of Computer Systems
1) Analog Computer
: An analog computer is a form of computer that uses the
continuously-changeable aspects of physical fact such as such as
electrical, mechanical, or hydraulic quantities for solving the
2) Digital Computer A computer that performs calculations
and logical, usually in the binary number system of “0”
and “1”. It can perform mathematical calculations, organize
and analyze data, control industrial and other processes, and
simulate dynamic systems such as global weather patterns.
4. 3) Hybrid Computer
A computer that processes both analog and digital data,
The digital component normally provides logical and
numerical operations, while the analog component often
serves as a solver of differential equations and other
mathematically complex equations.
5. Different types of Digital Computer
1.)Super computers : The super computers are
the most high performing system. They are used for
intensive computation tasks in various fields,
including quantum mechanics, weather forecasting,
climate research, oil and gas exploration,
molecular modelling, physical simulations,
aeronautical engineering, scientific data processing .
eg: PARAM, IBM Deep Blue, jaguar, roadrunner.
6. 2)Mainframe computers
Computers with large storage capacities and very high
speed of processing are known as mainframe
they are usually used by big organisations for bulk
processing such as statics, census data processing,
transaction processing like ATM transactions and are
widely used as the severs as these systems has a
higher processing capability as compared to the other
classes of computer.
Eg: IBM z Series, IBM 370, S/390.
7. 3) Mini
It is a multi processing system capable of supporting 4-200 users
simultaneously Minicomputers may contain one or more
processors, support multiprocessing and tasking, and are
generally resilient to high workloads. Minicomputers are used for
scientific and engineering computations, business-transaction
processing, and database management,
Eg IBM midrange computers, Digital Alpha, Sun Ultra.
8. 4) Micro computers
A microcomputer have microprocessor as its CPU. It includes a
microprocessor, memory, and minimal I/O circuitry mounted on
a single printed circuit board. It is a small, relatively inexpensive
computer. They actually formed the foundation for present day
microcomputers and smart gadgets that we use in day to day
Microcomputer can be classified into 2 types :
The difference is portables can be used while travelling
whereas desktops computers cannot be carried around.
The different portable computers are: -
ii) Notebooks/Palmtop/Digital Diary
A desktop computer is a personal computer that fits on or under
a desk. It has a monitor or another display, keyboard, mouse, and
either a horizontal or vertical form factor.
b)Portable computerThe difference is portables can be used while travelling whereas
desktops computers cannot be carried around.
i)Laptop:computer is similar to a desktop computers but the size
It is a portable computer with an integrated screen and
keyboardii) Notebooks/Palmtop/Digital Diary/PDA:
These computers are small in size. They can be held in hands.
It may or may not have keyboard and screen
These computers are not as powerful as desktop computers.