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Computer
ApplicationChapter 2: Computer Hardware
Ms Saidah Sarpudin
-0136089349-
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Understanding on function of processor
Understanding on function of Data storage
Understanding on function of Input devices
Understanding on function of Output device
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Input Device
Output
Device
CPU /Memory
Storage
Device
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http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&docid=t_mNYEuNLkdeUM&tbnid=1QPhL7tQPnGwDM:&ved=0CAUQjRw&url=http://www.comptechdoc.org/hardware/pc/begin/hwinside.html&ei=HZ65U96LMYPOkQW0iYDABw&bvm=bv.70138588,d.dGI&psig=AFQjCNHJ-rFCnNVyMX3kIn3IrTlx9ySbow&ust=14047598935053108/10/2019 Lecture 2 CompApp ComputerHardware
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Computer
Hardware
CPU
Storage
Input
Device
Output
Device
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Central processing UNIT (CPU) takes data and instructionsfrom storage unit and makes all sorts of calculations based on
the instructions given and the type of data provided.
Then, it send back to the storage unit
CPU includes Arithmetic Logic Unit (ALU) and Control Unit(CU
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Arithmetic Logic Unit
All calculations and comparisonsbased on the instruction provided are
carried out within the ALU.
It performs arithmetic functions likeaddition, subtraction, multiplication,
division and also logical operationslike greater than, less than and equal
to.
Control Unit
Controlling of all operations likeinput, processing and output are
performed by control unit.
It takes care of step by stepprocessing of all operations in side
the computer
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Output
Device
Storage
Input
Device
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Storage Device is hardware device capable of holdinginformation.
There are two(2) storage device used in computers.There are primary storage and secondary storage
Primary Storage is .
Example of input devices include keyboards, mouse,scanners, digital cameras and joysticks
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Output device is any peripheral that
receive or displays output from acomputer.
Types of output devices such asprinter, headphone, monitor, projector,sound card, speakers, TV
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Storage Device are devices used
to input data or information. There
are two (2) storage devices used
in the computer. There are:
a) Primary storageb) Secondary storage.
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Also known as main memory or internal memory.
The memory for the CPU
The only one directly accessible to the CPU.
The CPU continuously reads instructions stored there and executesthem as required.
Any data actively operated on is also stored there in uniform manner.
PrimaryStorage
The computer usually uses its input/output channels to accesssecondary storage and transfers the desired data using intermediatearea in primary storage.
Secondary storage does not lose the data when the device ispowered down it is non-volatile. Per unit, it is typically also two ordersof magnitude less expensive than primary storage.
Modern computer systems typically have two orders of magnitudemore secondary storage than primary storage and data are kept for alonger time there.
SecondaryStorage
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A computer communication device is a tool that enables
two or more computers to talk to each other.
For the communication to occur, the computers must
agree on the protocols and other procedures to be used. There are several kinds of communications devices used
in a computer.
Some of the device provide different ways of achieving
the same functionality and some that provide specializedservices.
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Communication
Device
Wireless
Bluetooth
Wi-fiCards
Routers
Modems
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