CAB Lecture 03

7/25/2019 CAB Lecture 03

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Computer Applications inBusinessMGT-312

Lecture:03

Instructor: Meer Qaisar

Jave


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!arts o" t#e Computer

$%stem


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!arts o" t#e Computer $%stem

Computer systems have four parts

Hardware Software

Data

User

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Hardware

Mechanical devices in the computer Anything that can be touched

Software

Tell the computer what to do Also called a program

Thousands of programs eist

Some for computer!s own useSome for the service of the user

"eason ma#ority of the people would want topurchase a computer

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Data

$ieces of information%individual facts &y themselves do not ma'e much sense

Computer organi(e and present data

Users $eople operating the computer

Most important part

Tell the computer what to doUserless computers)

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In"ormation !rocessin( C%cle

Steps followed to process data

*nput Computer accepts data from some source

$rocessing Computers processing components perform actions on the

data based on instructions from user or program

+utput Computer conveys result to user,

Tet- numbers- graphic- image- video- sound

+ptional

Storage $ermanently store result on some medium

+ptional

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+o, Computers or.All computers "ollo, t#e same "our/asic operations

1 Input

., $rocessing

/, Storage%Memory

0, +utput

-

1eyboard

Mouse
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+o, Computers or.Input

*nput hardware 2 devices that allow people toput data into the computer in a form that thecomputer can use

Allows the user to interact

*nput devices accept data

1eyboard3 an input device that convertsletters- numbers- and other characters into

electrical signals readable by the processor Mouse3 Select options from onscreen menu

-


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+o, Computers or.Input

+ther *nput devices) Scanners

Microphone

4ebcam Digital Camera

-


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+o, Computers or.All computers "ollo, t#e same "our /asicoperations

5, *nput

2 !rocessin(

/, Storage%Memory

0, +utput

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Case or system cabinet


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$rocessing devices

&rains of the computer Carries out instructions from the program

Manipulate the data

Most computers have several processors Central $rocessing Unit 6C$U7

Secondary processors

$rocessors made of silicon and copper

+o, Computers or.


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+o, Computers or.


$rocessor chip

$rocessor chip 2 Atiny piece of siliconthat containsmillions of miniature

electronic circuits,


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+o, Computers or.All computers "ollo, t#e same "our /asicoperations5, *nput

., $rocessing

3 $tora(e5Memor%

0, +utput

$rimary storage

6memory7 2 "AM

Computer circuitry thattemporarily holds datawaiting to be processed

Secondary storage6storage7 2 "+M

The area in the computerwhere data or informationis held permanently

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+o, Computers or.

Storage capacity is represented in3

5 byte 2 5 character of data, 5 'ilobyte 8 .59bytes%char: 5-9.0

characters,

5 megabyte 2 ..9bytes%char 5-90;-

characters, 5 gigabyte 2 more than 5 billion

characters,

5 terabyte 2 more than 5 trillion

characters,


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+o, Computers or.

"andom Access Memory Also 'nown as "AM or

memory

"epresent primary storage ortemporary storage,

Hold data before processing

and information afterprocessing,

?olatile

More "AM results in a faster

system *n Mega%@iga &ytes


"AM


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+o, Computers or.

"ead +nly Memory

Also called "+M $ermanent storage of

programs

Holds the computer boot

directions Typically in 1ilo&ytes


"+M

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+o, Computers or.

Storage devices

Hold data and programs permanently Dierent from "AM

Magnetic storage

Bloppy and hard driveUses a magnet to access data

+ptical storage

CD and D?D drives- &lue2"ay

Uses a laser to access data

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+o, Computers or.$tora(e

-

ip dis'

Bloppy dis'

Bloppy2dis' drivestores data onremovable /,


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Hard2dis' drive

a storage device that

stores billions of

characters of data on

a nonremovable dis'

platter,

Capacity 09@&2

/.9@& or even more


Hard2dis' drive

+o, Computers or.$tora(e

.


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CD 6Compact Dis'7 drive or D?D6Digital ?ideo Dis'7 drive

a storage device that uses lasertechnology to read data fromoptical dis's,

=99M& for CD5,0 to 5= @& for D?D

&lue "ayoptical disc storage

high2deEnition video and datastorage,

same physical dimensions asstandard D?Ds and CDs,

Currently Upto


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5, *nput

., $rocessing

/, Storage

0, +utput


+utput hardware devices which translate

info processed by the

computer into a formthat humans canunderstand

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+o, Computers or.7utput

Sound Card

Coverts audio signal fromdigital to analog and viceversa

&oth *nput and +utput

device

Spea'ers

the devices that play

sounds transmitted aselectrical signals from thesound card,

Sound card

Spea'ers

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?ideo card

converts the processor!soutput information into avideo signal that can besent through a cable to the

monitorMonitor

the display device thatta'es the electrical signalsfrom the video card andforms an image usingpoints of colored light onthe screen


?ideo card

+o, Computers or.7utput

Monitor


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5, *nput

., $rocessing

/, Storage

0, +utput


$rinter 2 an output devicethat produces tet andgraphics on paper,

+ C t .


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+o, Computers or.Communication 8


Modem

Modem 2 a device thatsends and receives dataover telephone lines to andfrom computers,

Fetwor' *nterface Card

F*C 8 Controls the owof data on a networ'lin'

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+o, Computers or.+o, oes ever%t#in( connect8


Motherboard

the main printed

circuit board in the

computer

Gverything connects to

the motherboard

Gpansion slots 2

plugsI on the

motherboard for

epanding the $C!s

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Motherboard

+o, Computers or.+o, oes ever%t#in( connect8

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4hat is Jeft)

$ower *nside system cabinet

$o"t,are uns T#e Mac#ine
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Tells the computer what to do

"eason people purchase computersTwo types

System software

Application software

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System software

Most important software +perating system

4indows K$

Fetwor' operating system 6+S74indows Server .99/

Utility

Symantec Anti?irus

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Application software

Accomplishes a speciEc tas' Most common type of software

MS 4ord

Covers most common uses of computers

CAB Lecture 03

Documents

Transcript of CAB Lecture 03