Introduction to computer according to veta curicullum

MODULE:INTRODUCTION TO COMPUTER
UNIT :ORGANIZING MICRO COMPUTER
ELEMENT: connecting peripherals to micro computer
ALPHONCE FIDELIS STEPHANO ~0716236593|BIGWA FDC 339 MOROGORO

1.It accepts data or instruction by way of
input,
2. it stores data,
3. it can process data as required by the user,
4. it gives results in the form of output, and
5. it controls all operations inside a
computer.

 Input: this is the process of entering data and
programs into the computer system.
 Control Unit (CU): The process of
input,output,processing and storage is
performed under the supervision of a unit called
'Control Unit'.
 It decides when to start receiving data,
 when to stop it,
 where to store data, etc.
It takes care of step-by-step processing of all operations
in side the computer.

Memory Unit: Computer is used to store data and
instructions.
Arithmetic Logic Unit (ALU): The major operations
performed by the ALU are addition(+), subtraction(-
),multiplication(x), division(/), logic and comparison(yes/no).
Output: This is the process of producing results from the
data for getting useful information.
The ALU and the CU of a computer system are jointly known
as
the central processing unit (CPU).
You may call CPU as the brain of any computer system.

What are the five basic operations performed by the
computer?
Define ALU, CU and CPU.
Choose the correct answer.
1. The task of performing arithmetic and logical operations is called
a. ALU
b. editing
c. storage
d. Output
2. The ALU and CU jointly are known as
a. RAM
b. ROM
c. CPU
d. None of above
3. The process of producing results from the data for getting useful information is
called
a. output
b. input
c. processing
d. storage

 Peripheral devices are connected to the computer
externally.
 These devices are used for performing some
specific functions.
Peripheral devices are as follows:
1. Input Devices
2. Output Devices
3. Other Peripherals

Introduction to computer according to veta curicullum

 INPUT DEVICES
 Input devices accept data and instructions from the
user
Example
1. Keyboard
2. Mouse
3. Light Pen
4. Optical/magnetic Scanner
5. Touch Screen
6. Microphone for voice as input
7. Track Ball

 is the most common input device.
Several kinds of keyboards are available, but
they
 The keyboard in most common use is the
QWERTY board.
 Generally standard keyboard has 104 keys.
 In these keyboards, the cursor control keys are
duplicated to allow easier use of the numeric
pad.

 A mouse is an electro-mechanical, hand-held
device .
 It is used as a pointer.
 It can perform functions like selecting menu
commands, moving icons, resizing windows,
starting programs, and choosing options.

 The most common mouse uses an internal,
magnetically coated ball, to detect the
movement of the mouse across a flat surface,
 Now a days Optical or laser mouse is used to
detect the movement.

 An input device that utilizes a light-sensitive
detector to select objects on a display screen.
 A light pen is similar to a mouse , except that
with a light pen you can move the pointer and
select objects on the display screen by directly
pointing to the objects with the pen.

 These devices are used for automatic data collection.
 The devices of this category completely eliminate
manual input of data.
 For example, the bar-code reader is actually just a special
type of image scanner.
 An image scanner translates printed images into an electronic
format that can be stored in a computer’s memory, and with the
right kind of software, one can alter a stored image.
 Another example of scanner is optical character recognition
(OCR) device, used by banks to convert the scanned image of a
typed or printed page into text that can be edited on the
computer.

 Touch panel displays and pads are now being
offered as alternatives to keyboard. Here the
input can be given through the computer
screen, that accepts the input through monitor;
users touch electronic buttons displayed on the
screen or they may use light pen.

 Microphone is an input device, which takes
voice as input.
 The voice communication is more error-prone
than information through keyboard.
There are two types of microphones available
1. Desktop Microphone
2. Hand held Microphone

Hand held Microphone Desktop Microphone

 Trackball, a pointing device, is a mouse nlying
on its.
 To move the pointer, you rotate the ball with
your thumb, your fingers, or the palm of your
hand.
 There are usually one to three buttons next to
the ball, which you use just like mouse buttons.

Output devices return processed data that is
information, back to the user.
Some of the commonly used output devices are:
1. Monitor (Visual Display Unit)
2. Printers
3. Plotter
4. Speakers

 Out of all the output devices, monitor is perhaps
the most important output device because people
interact with this device most intensively than
others.
 Computer information is displayed, visually with
a video adapter card and monitor. Information
processed within the CPU, that needs to be
visually displayed, is sent to video adapter.
 The video adapter converts information from the
format used, in the same manner as a television
displays information sent to it by a cable service

1. CRT
 Cathode Ray Tube (CRT): CRT or Cathode Ray Tube Monitor is the
typical monitor that you see on a desktop computer.
 It looks a lot like a television screen, and works the same way.
 This type uses a large vacuum tube, called cathode ray tube (CRT).
2. LCD
 Liquid Crystal Displays (LCD): This type of monitors are also known as
flat panel monitor. Most of these employ liquid crystal displays (LCDs) to
render images. These days LCD monitor are very popular.

 After a document is created on the
computer, it can be sent to a printer
for a hard copy (printout). Some
printers offer special features such as
colored and large page formats.

1.Laser printer
2. Ink jet printer
3.Dot matrix printer
4.Line printer

 Speakers are another type of
output device, which allow
you to listen to voice like
music, and conversation with
people.

 Software refers to a set of programs that makes
the hardware perform a particular set of tasks
in particular order.
 Sets of instructions are called Programs.

 System software's are sets of programs,
responsible for running the computer,
controlling various operations of computer
systems and management of computer
resources.eg: operating system (os).

 An operating system is a system software that
provides an interface for a user to communicate
with the computer, manages hardware devices
(disk drives, keyboard, monitor, etc), manages
 and maintains disk file systems and supports
application programs.
 Some popular Operating systems are UNIX,
Windows and Linux

 These are programs that bridge the gap
between the functionality of an OS and the
needs of users.
 Utility programs are a broad category of
software such as compress (zip)/uncompress
(unzip) files software, anti virus software, split
and join files software, etc.

 Application software is a set of programs, which
are written to perform specific tasks, for example:
1. Generalized packages
 Word Processing Software(for preparing documents):
Word Perfect, MS-Word, OpenOffice.org Writer
 Spreadsheets (Data Analysis): Lotus Smart suites, MS-
Excel, OpenOffice.org Calc, Apple Numbers
 Presentations : Presentation Graphics, MS-PowerPoint,
OpenOffice.org Impress
 Database Management System: MS-Access,
OpenOffice.org Base, MS-SQL Server, ORACLE
 Graphics Tools: Paint shop pro, Adobe Photoshop

2. Customized Packages
 These are the applications that are customized (or
developed) to meet the specific requirements of an
organization/institution.
For Example: Student information details, Payroll
packages, inventory control etc.
 These packages are developed using high-level
computer language.

 What is a Port?
A port: Is a physical docking point using which an
external device can be connected to the computer.
 Can also be programmatic docking point through
which information flows from a program to
computer or over the internet.

A port has the following characteristics:
 External devices are connected to a computer
using cables and ports.
 Ports are slots on the motherboard into which a
cable of external device is plugged in.
 Examples of external devices attached via ports
are mouse, keyboard, monitor, microphone,
speakers etc

Serial Port
 Used for external modems and older computer
mouse
 Two versions : 9 pin, 25 pin model
 Data travels at 115 kilobits per second
Parallel Port
 Used for scanners and printers
 Also called printer port
 25 pin model
 Also known as IEEE 1284-compliant Centronics
port

PS/2 Port
 Used for old computer keyboard and mouse
 Also called mouse port
 Most of the old computers provide two PS/2 port, each for mouse and
keyboard
 Also known as IEEE 1284-compliant Centronics port
Universal Serial Bus (or USB) Port
 It can connect all kinds of external USB devices such as external hard
disk, printer, scanner, mouse, keyboard etc.
 It was introduced in 1997.
 Most of the computers provide two USB ports as minimum.
 Data travels at 12 megabits per seconds
 USB compliant devices can get power from a USB port

VGA Port
 Connects monitor to a computer's video card.
 Has 15 holes.
 Similar to serial port connector but serial port
connector has pins, it has holes.
Power Connector
 Three-pronged plug
 Connects to the computer's power cable that
plugs into a power bar or wall socke

 Firewire Port
 Transfers large amount of data at very fast speed.
 Connects camcorders and video equipments to the
computer
 Data travels at 400 to 800 megabits per seconds
 Invented by Apple
 Three variants : 4-Pin FireWire 400 connector, 6-
Pin FireWire 400 connector and 9-Pin FireWire 800
connector

Modem Port
 Connects a PC's modem to the telephone network
 Ethernet Port
 Connects to a network and high speed Internet.
 Connect network cable to a computer.
 This port resides on an Ethernet Card.
 Data travels at 10 megabits to 1000 megabits per
seconds depending upon the network bandwidth.

Game Port
 Connect a joystick to a PC
 Now replaced by USB.
Digital Video Interface, DVI port
 Connects Flat panel LCD monitor to the
computer's high end video graphic cards.
 Very popular among video card manufacturers.
Sockets
 Connect microphone, speakers to sound card of
the computer

I. Keyboard and mouse: Set up the keyboard right in front of where you’ll sit when you
use the computer, between you and where the monitor goes. The mouse lives to the
right or left of the keyboard, depending on whether you’re right- or left-handed.The PC
keyboard plugs into the keyboard port on the back of the console. The mouse plugs
into the mouse port. Note that the two ports look identical but are different.
II. Monitor: Set the monitor atop your desk, generally back away from where you sit, to
accommodate room for the keyboard.
The monitor plugs into the VGA, or graphics adapter, jack on the back of the console.
The plug goes in only one way.
III. Network: Plug the network, or Cat 5, cable into the network jack on the back of the
console. This is how you connect your PC to a network, or how you connect to a
broadband modem.
iv. Printer: Set up the printer where it’s within arm’s reach of the console. To get the printer
and console talking to each other, you need a cable, either a USB cable or the traditional
printer cable. When you’re blessed with a wireless printer, keep it close enough to the
console to ensure that it’s in range of the signal.
v. USB: USB devices plug into the USB port — any USB port. The USB cable may be
attached directly to the gizmo, or you may have to use (or buy) a separate USB cable.

 Plug in your computer and all peripherals.
Peripherals include such items as your monitor,
keyboard, mouse and printer, if you have one. In order
to protect your computer, you should use a surge
protector.
 Turn on the surge protector. Usually surge protectors
feature a light that will glow when powered on.
 Press the power button on your computer or CPU
(Central Processing Unit). These buttons can be
recognized by the power symbol, a circle with a
vertical line intersecting the top of it. Your computer
will boot, and you can begin using it as desired.

 “using a computer should
enable you to focus on what
you want to accomplish
instead of how to
accomplish”
ALPHONCE ASSENGA
Diploma in computer science and engineering
alphoncesteven@gmail.com

Introduction to computer according to veta curicullum

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Introduction to computer according to veta curicullum