Computer Fundamentals lecture 1 Basic components of computer system.pptx

Computer Fundamentals
Prepared by
Shyama Barna Bhattacharjee
Lecturer (CSE)
University of Science and Technology Chittagong (USTC)

Course Introduction
• Course Code: CSE 111
1. Credit Value: 3
• Assesment :
Assessment Method Percentage of Marks
Allotted
1. Class attendance 10%
1. Mid Term Examination 20%
1. Class Test/ Assignment/
Presentation/Case
study/Project
20%
1. Final Examination 50%

Text Books and Reference Books:
• Computer Fundamentals by Pradeep K. Sinha, 6th Edition.
• Introduction to Computer by Peter Norton.
• Fundamentals of Computers by V. Rajaraman and N. Adabala, 6th
Edition.

What is Computer ?
A computer is a programmable electronic device that accepts raw data
as input and processes it with a set of instructions (a program) to
produce result as output. It can process numerical as well as non
numerical calculations. The term “COMPUTER”is derived from the latin
word “COMPUTARE” which means to calculate .

The activity of processing data using a computer is called
data processing
Data
Capture Data
Manipulate Data
Output Results
Information
Data is raw material used as input and information is
processed data obtained as output of data processing

Characteristics of Computers
1) Automatic: Given a job, computer can work on it
automatically without human interventions
2) Speed: Computer can perform data processing jobs
very fast, usually measured in microseconds (10-6),
nanoseconds (10-9), and picoseconds (10-12)
3) Accuracy: Accuracy of a computer is consistently high
and the degree of its accuracy depends upon its design.
Computer errors caused due to incorrect input data or
unreliable programs are often referred to as Garbage In-Garbage-Out
(GIGO)

4) Diligence: Computer is free from monotony, tiredness, and lack of
concentration. It can continuously work for hours without creating any error
and without grumbling
5) Versatility: Computer is capable of performing almost any task, if the task
can be reduced to a finite series of logical steps
6) Power of Remembering: Computer can store and recall any amount of
information because of its secondary storage capability. It forgets or looses
certain information only when it is asked to do so.
7) No I.Q.: A computer does only what it is programmed to do. It cannot take
its own decision in this regard
8) No Feelings: Computers are devoid of emotions. Their judgement is based
on the instructions given to them in the form of programs that are written by
us (human beings)

Evolution of Computers
Charles Babbage is considered to be the father of
modern digital computers
• He designed “Difference Engine” in 1822
• He designed a fully automatic analytical engine in
1842 for performing basic arithmetic functions
• His efforts established a number of principles that
are fundamental to the design of any digital
compute

Computer Generations
Generation
(Period)
Key hardware
technologies
Key software
technologies
Key
characteristics
Some
representative
systems
First
(1942-1955)
 Vacuum tubes
 Electromagnetic
relay memory
 Punched cards
secondary storage
 Machine and
assembly
languages
 Stored program
concept
 Mostly scientific
applications
 Bulky in size
 Highly unreliable
 Limited commercial
use and costly
 Difficult commercial
production
 Difficult to use
 ENIAC
 EDVAC
 EDSAC
 UNIVAC I
 IBM 701
Second
(1955-1964)
 Transistors
 Magnetic cores
memory
 Magnetic tapes
 Disks for secondary
storage
 Batch operating
system
 High-level
programming
languages
 Scientific and
commercial
applications
 Faster, smaller, more
reliable and easier to
program than previous
generation systems
 Commercial production
was still difficult and
costly
 Honeywell 400
 IBM 7030
 CDC 1604
 UNIVAC LARC

Generation
(Period)
Key hardware
technologies
Key software
technologies
Key
characteristics
Some rep.
systems
Third
(1964-1975)
 ICs with SSI and
MSI technologies
 Larger magnetic
cores memory
 Larger capacity
disks and
magnetic tapes
secondary
storage
 Minicomputers;
upward compatible
familyof computers
 Timesharing
operating
system
 Standardizationof
high-level
programming
languages
 Unbundling of
software from
hardware
 Faster, smaller, more
reliable, easier and
cheaper to produce
 Commercially, easierto
use, and easier to
upgrade than previous
generation systems
 Scientific, commercial
and interactive on- line
applications
 IBM 360/370
 PDP-8
 PDP-11
 CDC 6600

Generation
(Period)
Key hardware
Technologies
Key software
technologies
Key
characteristics
Some rep.
systems
Fourth (1975-
1989)
 ICs with VLSI
technology
 Microprocessors;
semiconductor memory
 Operating systems for PCs
with GUI and multiple
windows on a single
terminal screen
 Multiprocessing OSwith
concurrent
programming languages
 UNIX operating system with
C programminglanguage
 Object-oriented design and
programming
 PC, Network-based, and
supercomputing
applications
 Small, affordable,
reliable, and easy to
use PCs
 More powerful
and reliable
mainframe systems
and
supercomputers
 Totally general
purpose machines
 Easier to produce
commercially
 Easier to upgrade
 Rapid software
development
possible
 IBM PC and
its clones
 Apple II
 TRS-80
 Larger capacity hard
disks as in-built
secondary storage
 Magnetic tapes and
floppy disks as portable
storage media
 VAX 9000
 CRAY-1
 CRAY-2
 CRAY-X/MP
 Personal computers
 Supercomputers basedon
parallel vector
processing and
symmetric multiprocessing
technologies
 Spreadof high-speed
computer networks

Generation
(Period)
Key hardware
technologies
Key software
technologies
Key
characteristics
Some rep.
systems
Fifth
(1989-
Present)
 ICs with ULSI
technology
 Larger capacity
main memory, hard
disks withRAID support
 Optical disks as
portable read-only
storage media
 Notebooks, powerful
desktopPCs
and
workstations
 Powerful servers,
supercomputers
 Internet
 Cluster computing
 Micro-kernel based,
multithreading,
distributed OS
 Parallel programming
libraries like MPI &PVM
 JAVA
 World Wide Web
 Multimedia,
Internet
applications
 More complex
supercomputing
applications
 Portable computers
 Powerful, cheaper,
reliable, and easier to
use desktop machines
 Powerful
supercomputers
 High uptime due tohot-
pluggable components
 Totally general
purpose machines
 Easier to produce
commercially, easier to
upgrade
 Rapid software
development possible
 IBM notebooks
 Pentium PCs
 SUN
Workstations
 IBM SP/2
 SGI Origin 2000
 PARAM 10000

Electronic Devices Used in Computers of
Different Generations
A Vacuum Tube
A Transistor An IC
Chip

The Five Basic Operations of a Computer
System
• Inputting. The process of entering data and instructions into the computer
system
• Storing. Saving data and instructions to make them readily available for
initial or additional processing whenever required
• Processing. Performing arithmetic operations (add, subtract, multiply,
divide, etc.) or logical operations (comparisons like equal to, less than,
greater than, etc.) on data to convert them into useful information
• Outputting. The process of producing useful information or results for the
user such as a printed report or visual display
• Controlling. Directing the manner and sequence in which all of the above
operations are performed

Central Processing Unit (CPU)
Storage Unit
Secondary
Storage
Primary
Storage
Control
Unit
Arithmetic
Logic Unit
Input
Unit
Output
Unit
Program
and
Data
Information
(Results)
Indicates flow of
instructions and data
16
Indicates the control
exercised by the
control unit
Basic Organization/Components of a Computer
System

An input unit of a computer system performs the
following functions:
1. It accepts (or reads) instructions and data from outside
world
2. It converts these instructions and data in computer
acceptable form
3. It supplies the converted instructions and data to the
computer system for further processing
Input Unit

An output unit of a computer system performs the
following functions:
1. It accepts the results produced by the computer, which
are in coded form and hence, cannot be easily
understood by us
2. It converts these coded results to human acceptable
(readable) form
3. It supplies the converted results to outside world
Output Unit
Output Unit

Storage Unit
The storage unit of a computer system holds (or stores) the following :
1. Data and instructions required for processing (received from input devices)
2. Intermediate results of processing
3. Final results of processing, before they are released to an output device

Two Types of Storage
 Primary storage
 Used to hold running program instructions
 Used to hold data, intermediate results, and results of ongoing
processing of job(s)
 Fast in operation
 Small Capacity
 Expensive
 Volatile (looses data on power dissipation)

Two Types of Storage
 Secondary storage
 Used to hold stored program instructions
 Used to hold data and information of stored jobs
 Slower than primary storage
 Large Capacity
 Lot cheaper that primary storage
 Retains data even without power

Arithmetic Logic Unit (ALU)
Arithmetic Logic Unit of a computer system is the place
where the actual executions of instructions takes place during
processing operation

Control Unit
Control Unit (CU)
Control Unit of a computer system manages and
coordinates the operations of all other
components of the computer system

Central Processing Unit (CPU)
Arithmetic
Logic Unit
(ALU)
Control Unit
(CU)
=
Central
Processing
Unit (CPU)
 It is the brain of a computer system
 It is responsible for controlling the operations of
all other units of a computer system
+

The System Concept
A system has following three characteristics:
1. A system has more than one element
2. All elements of a system are logically related
3. All elements of a system are controlled in a manner to
achieve the system goal
A computer is a system as it comprises of integrated
components (input unit, output unit, storage unit, and CPU)
that work together to perform the steps called for in the
executing program

Computer Fundamentals lecture 1 Basic components of computer system.pptx

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Computer Fundamentals lecture 1 Basic components of computer system.pptx