learn classification of computer system based on their size,there components,features,and types of computer with functionality,speed and capabilities.

1. What are the Basic Classifications of Computer System?
What is a Computer:: It is a device which can store gigantic amount of data or information and can
perform numerous calculations and also can perform different and diverse task given to them, there are
special computer for specific task and operations for example for space investigation and exploration,
nuclear science, genetic engineering .Supercomputers are used because they are developed and are
specialized in this type of operations and our expertise in this field. For home use just for entertainment
watching movies, songs and graphics, etc home PC or desktop computers are suitable for these sorts of
purposes.
For administrators, executives, representatives, and businessman laptop use is common and is utilized
broadly and widely because of its mobility and portability as well as it can be used with the assistant of
battery available inside every laptop. And surely it can perform each and every task compared to Desktop
or Home PC (Personal Computer), therefore the classification of computers can be done with the help of
some features they are size, functionality, capabilities and speed.
Three Types of Computer
The Computer are classified into three main types::
• Analog Computers
• Digital Computers
• Hybrid Computers (Analog + Digital)
Analog Computers:: Analog Computer measures “Physical Quantities” for example Temperature,
Voltage, Pressure, and Electric Current. These are the quantities which are continuously varied and
persistently change from one measurement to another, just like the temperature of a human being or
individual. They process the given data or instruction or information into an analog data or simple data.
They are equipped for measuring instead of counting or checking. They are also specifically designed for
measuring and can perform arithmetical calculation upon number where numbers are indicated by
physical quantities or physical amount. Analog Computers are used in scientific and industrial ventures,
where they have to screen temperature, voltages and electric currents.

2. Examples of Analog Computer::
• Speedometer
• Thermometer
Digital Computers:: The “Digital Computers” can complete or perform Arithmetic and logical operation
when given to them in a type of binary number system .These types of computers are not for measuring
physical quantities such as temperature, electric current, and voltages. They are high speed
programmable machines or computers which can play out numerous mathematical calculations, and can
store the data or information .When any instruction or direction given to them they convert that instruction
or data or information into machine readable form that is 0 or 1 which is called as “Binary Number
System”.
Examples::
• Desktop Computer OR Personal Computer (PC)
• Laptop
Hybrid Computers (Analog + Digital) :: They posses both the qualities and features of Analog and
Digital computers, they can measure or gauge physical quantities as well as counting or checking and are
generally used in scientific and in medical use. Just for Example there are some machines which can
calculate the heartbeats and temperature of human body and converts or change them into numbers.
Basic Components of Computers
• Input
• Output
• Control Unit
• ALU
• Storage Unit
Before going further you must understand what is a computer system? Which I have explained above
Input:: Input unit accepts the data or set of instruction from outside the world with the assistant or help of
input devices such as keyboard and mouse. The input unit converts or changes the data into binary
number system and forwards the data for further and additional processing.
Output:: Output unit is a unit which produces or create the result or outcome , the data or information
which is entered into the computer system is in binary form the output unit converts the data into human-
readable or intelligent form and produce or deliver the output with the help of printers and monitors.
Control Unit:: Control unit can be called as a supervisor or nervous system of internal operation, it
interprets and translates in each and every single operation provided to the computer system. At the point
when the data is provided to computer system it take fundamental and necessary action, it controls every
action and later decides what to do with the data or information presented to it.
The control unit controls and facilitates with every unit present in PC

3. ALU :: ALU stands for “Arithmetic and Logical Unit“ It is responsible and in charge for all the operations
such as Addition, Subtraction, Multiplication, Division , Comparison, and logical operations such as (Equal,
Less, Greater) used in the operations. The results and outcomes from Arithmetic and Logic Unit are stored
in a temporary memory.
Storage Unit:: There are two types of storage unit in the Computer systems
• Primary Storage ::
• Secondary Storage ::
Primary storage:: Primary storage can be called as “MAIN MEMORY” ,it can not hold or save the data if
there is a power failure or when there is no power to computer system ,hence it can also be called as
“TEMPORARY MEMORY” The data or set of instruction are stores in primary memory before transferring
to ALU for additional preparing The primary memory has a limited storing capacity as compared to
secondary storage, and are very expensive.
Example : RAM(Random Access Memory)
Secondary Storage:: Secondary storage can be called as “PERMANENT STORAGE”, it can hold or save
the data or set of instruction almost permanently if there is a power failure or no power still the user can
retrieve the data whenever needs. They can store huge amount of data and are cheaper then Primary
memory.
Example ::( HDD) HARDDISK DRIVES
Classification of Computer Based on Size
The computer can be classified in four different types
• Super Computers
• Mini Computers
• Micro Computers
• Mainframe Computers
Super Computer:: They are tremendously fast and can perform millions of instruction per second their
speed is calculated in “FLOPS” Floating Point Operations, they can perform over 1.2 billion instruction per
second and can store huge amount of data, they are immense in size, and are most powerful then any
other computer and are used in complex scientific application such as nuclear energy , genetic
engineering , Atomic energy, weather forecasting , defense , space exploration and so forth. They are also
used in counting the measurement of earthquakes, they are substantially more costlier when contrasted or
compared with others.
Example ::
• PARAM
• Tianhe-2
Mini computers :: They are commonly known as “Midrange Computers” they were developed in 1960’s
using transistors and core memory technology and are smaller, cheaper, and has an enormous data or
information storage capacity, Minicomputers are used in production industry where they are defined a task

4. or assignment to monitor the production process. can be used or utilized as a “HOST” in a system
networking condition with 100s of terminals ,they have a difficult operating system can perform different
task simultaneously. They are digital computers which can perform with high speed and are used in
independent ventures and also in scientific use. The powerful minicomputers are called as “SUPER-
MINIS”
Micro Computers:: They are the most common and well-known types of computers .They used
microprocessor is a silicon chip where hundreds of component are fit such as transistor ,capacitor and
resistor. They possess input, output , storage ,control unit for better functionality of computers.
Microcomputers are also called as “PERSONAL COMPUTERS” they are truly modest really cheap, high
performing, with a decent storage unit, and have become really famous in the end user market these days
due to its efficiency and low in cost. They can be treated as a “WORKSTATION” where several other PC
can connect to them in the computer networking environment.
• Desktop Computers
• Laptops
• Notebooks
• Handheld Computer or Personal Digital Assistant (PDA)
• Mobile Devices
Desktop Computer :: Are also called as “personal computers” and are cheap, small in size, reliable,
works with AC Power they are so small to a point that they can be fit on a table. Input devices such as
keyboard and mouse can be used or utilized in desktop PC they don't have mobility and versatility or
neither they are portable.
Laptops :: Laptops are hugely popular these days as they are mobile and can be used on any location.
Students, professionals, even businessman can carry out their working anywhere they like, they can work
with AC Power or with Battery. Each and every operation or application can be used, with high speed and
high performance (CPUs), Dell & Compaq are the leading brand that manufactures Laptop.
Notebooks :: Notebooks are smaller devices or little gadgets with Graphical display screen, user can
watch movies, surf the net and can perform each and every action or operation compared to laptops and
desktops.
Handheld Computer or Personal Digital Assistant (PDA) :: The smallest of all is the handheld
computer called as Personal Digital Assistant (PDA).They are extremely smaller in size, PDA are pen-
based computer as they do their operations utilizing a pen-like stylus..
Mobile Devices: : They are extremely small devices as these devices are so small they can be kept in our
pockets. Android and Windows-based operating system mobiles are available in market .user can carry
out an operation such as playing movies, songs, surfing the net. They are hugely popular as their
functionality has been enhanced drastically with improved hardware and software features.
Related Articles and Sources::
http://www.chtips.com/computer-fundamentals/characteristics-of-computer-system
http://www.chtips.com/computer-fundamentals/classification-of-computer-system
http://www.chtips.com/computer-fundamentals/what-is-cpu-in-computer