Name Id Topic
Components of computer system
CPU-Arithmetic logic unit
Operation perfomed by CPU
Memory & storage devices(RAM)
Flash memory, hard disk drives)
Processing devices(micro processors)
Advantages of computer in personal life &
A component of a computer's central
Implementing the instruction set of the CPU.
Performing the tasks of fetching,
Transferring data to ALU.
Finally, carry out instructions in the software and
to direct the flow of data through the computer
Functions of the control unit
COURSE NAME:COMPUTER IN
ARITHMETIC LOGIC UNIT IS THE PART
OF COMPUTER PROCESSOR(CPU)
THAT CARRIES OUT ARITHMETIC AND
LOGIC OPERATION ON THE OPERANDS
IN COMPUTER INSTRUCTION WORDS
THAT USE THE ALU
SPECIFY FOUR THINGS:
The operation to perform.
The the first operand (often in a register).
The second operand (often in a register).
The register that receives the result.
Dept. of Marketing
University of Rajshahi
Operation perform by CPU / Function
The CPU is said to be the brains of any computer system.
It provides all the timing and control signals necessary to
transfer data from one point to another in the system
the transfer of data between itself and the memory section
manipulation of data in the memory section or stored
the transfer of data between itself and input/output devices
WHAT IS INPUT?
Any data or instruction entered into the computer is known
An input device helps you to communicate with the
To enter information and issue commands, you use input
Examples of input devices:
Digital Camera and Web Camera
The keyboard is the most common and widely used input device.
It is made up of buttons called 'keys'. The keys are arranged into
• Alphabet keys
• Function or F keys (F1, F2, F3)
• Numeric keys (one set above the alphabet keys and
a numeric keypad on the right)
• Arrow keys
•Command keys (insert, delete, home, end, page up/down)
A mouse is an input devices that fits
comfortably under the palm of your hand.
A mouse is a pointing device.
We use mouse to control the movement of
the mouse pointer on the screen and to
make selections from the screen.
The bottom of a mouse is flat and contains a
mechanism that detects the movement of a
Types Of Mouse
Mouse in which the ball is replaced by an optical system
(light-emitting diode and sensor); it has no movable parts.
Mechanical or optical mouse that contains a scroll wheel.
Mechanical or optical mouse connected to the computer by
infrared or radio signals.
A scanner is a light-sensing input device that
reads printed text and graphics and then
translates the results into a form the
computer can use.
The image or text can be saved or changed
on the computer.
Types Of Scanner
Bar code reader
Device that uses an optical scanning process to
decode information contained in bar codes.
Equipment that converts a document’s graphics
or texts into digital data.
Images Of Scanner
Optical scanner Bar code reader
Device that converts electric pulses into broadcast
or recorded sounds.
A microphone allows you to record your voice
to the computer.
It also lets you speak to other people using
computers or even on the telephone.
A microphone is also called a mic.
A joystick is a pointing device that works on the principle of trackball
To make the movement of the spherical ball easier, it is placed in a
socket with a stick mounted on it
On most joysticks, a button on the top is provided to select the
option currently pointed to by the cursor
Commonly used for controlling player movements in video or
Digital Camera, camcodor
And Web Camera
Miniature digital camera used to transmit video images
in real time or for videoconferencing over the Internet.
Portable video camera in which the recording tape is
replaced by a processor, which records and stores
sounds and images in digital format.
Camera that contains a sensor and a microprocessor
rather than film; it records and stores images in digital
form, which can then be viewed on a screen.
Picture Of Digital Camera, Camcodor And
An output device is any piece of computer
hardware equipment used to communicate the
results of data processing carried out by an
information processing system (such as a
computer) to the outside world.
Monitor is a TV
like device that
It can display
text as well as
in color or black
& white while
the basis of
Sound cards enable the
computer to output
sound through speakers.
Speakers are required to
listen to music and video
This also allow us to
listen to the computer
Some monitors have
built in speakers.
sound output from the
They are similar to
speakers, except they are
worn on the ears so only
one person can hear the
output at a time.
A projector is a device that
enables an image, such as a
computer screen, to be
projected onto a flat surface.
These devices are commonly used in
meetings and presentations as they allow
for a large image to be shown so everyone
in a room can see.
Definition of RAM….
RAM stands for Random Access Memory . It is
the middleman of CPU and Hard drives . It
makes a relationship between CPU and hard
In other words, RAM is the part of computer
memory that is used while computer is doing
something. It is the short term memory and it’s
data storage capacity is volatile because when
the electricity is cut off ,then the storage in this
memory will be gone.
Function of RAM…
01. It helps to increase the speed of CPU ,so the
higher RAM is the higher speed of computer is.
02. It is the temporary memory computer uses to
store anything temporarily.
03. It acts as the intermediary between the hard
drive and CPU.
04. The data incoming and leaving the CPU passes
through the RAM easily
05. It holds all currently running information of
06. To run the application , firstly, it is loaded here
and then it works.
Types of RAM..
There are mainly two types of RAM.
(SRAM) Static RAM is consisted of flip-flop which contains
binary bits(0,1). In this RAM the data which is stored is
contained as far as the electricity is provided ,other it will be
03.Does not require any refreshment.
04.Use for cache
Dynamic RAM is a RAM where binary bits(0,1)
are contained in capacitor as electronic charge.
In DRAM chip ,capacitor is created by MOS
There are two types of DRAM.
01.Relatively low speed.
03. Requires refreshing periodically.
Types of Rom
Rom(Read only memory):
Rom used for storing program and data
parmanently. The data and programmes required for
some application stored in the rom chip.
1. User can only read from it
2. Manufacturer stores instruction into rom memory
3. It is permanent
Types of Rom:
PROM(programmable read only memory)
EPROM(Erasable programmable read only
EEPROM(Electronically Erasable and
programmable read only memory)
Flash memory is an electronic non volatile
computer storage medium that can be
electrically erased and reprogrammed.
Hard disk drives is the main and usually largest
data storage device in a computer.The operating
software tytle and most other files are stored in
hard disk drive
Computer in Business
Class i.d 13117504
What is microprocessor?
A microprocessor incorporates in function of a computers central
processing unit [cpu] on a single integrated circuit [ic]. Microprocessor is
a multipurpose programmable device that accepts digital data as input,
process it according to instruction stored in its memory and provides
results as output. It is an example of sequential digital logic.
History of microprocessor:
At this modern age we get computers at lower cost. General purposes of
microprocessor in personal computers are used for computation, tax editing,
multimedia display etc. Intel 4004 is the first commercial microprocessor. It
introduced in the market in November 1971. It is very important invention of
the 20th century
Structure of microprocessor:
The microprocessor is also known as the central processing unit[cpu]. IT is the
brain of the computers.
Work of microprocessor:
Now the computer I use to read this page using a microprocessor to this
work. The microprocessor is the heart of any normal computer whether it is
desktop machine, a server or a laptop. A microprocessor is a computer
processor on a micro chip. The work of microprocessor is given below:
1. For computation
2. Tax editing
3. Communication through internet.
4. Multimedia display.