Group SIXLu pingStrahanYin Tong

Input Devices

“An input device is any peripheral (piece of computer hardware

equipment) used to provide data and control signals to an

information processing system such as a computer or other

information appliance. “

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Wikipedia

Input devices are things we use to put information

INTO a computer!

Oh…Those in the last slide are common input devices:

- Keyboard- Microphone- Scanner- Mouse- Camera- Tablet/Touchscreen

And more (jockey stick, light pen, bar code scanner….)

P.S. Pictures are only for reference! They are not real!

Purposes?O Accept user commands and send

them to the computer for processingO Convert people-readable form of

data into a machine-readableO Feeds data or instruction into a

computer for display and transmission

Output Devices

“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.”

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Wikipedia

Output devices are things we use to get information OUT of

a computer!

Purposes?O Accept results or information

generated by the computerO Present those information to the user

in a variety of means

And…Those in the last slide are common output devices:

- Screen/Monitor- Speaker- Headphone- Printer

And more (….)

P.S. (again..) Pictures are only for reference! They are not real!

ProcessorsAh…oligopoly power…

More about processorsOThe central processing unit (CPU) is the portion

of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer.

IntelO Commonly used in prefabricated computer

systems, such as those from Dell and HPO Two different lines of processors: the Pentium

and the Celeron Pentium processors: larger microchip style that

works on most desktop and some laptops. They can handle high-demand processing, such as that found in 3D gaming, video editing and other multimedia-intense applications.

Celeron processors: compact models with the ability to run a basic computer efficiently and cost-effectively.

AMDO Home-built systems or specially

designed machinesO The main two lines of processors: Athlon

and Sempron The Sempron processors: lower price, but

worse in playing games, because they have half the L2 cache of the Athlon processors

The Athlon processors: better processors in comparison

Samsung Mobile processors

O The Apple A5 and A5X are package on package (PoP) system-on-a-chips (SoCs) designed by Apple Inc. and fabricated by Samsung to replace the Apple A4.

O The chip commercially debuted with the release of Apple's iPad 2 tablet, and also powers the iPhone 4S and 3rd generation iPad. (This is consistent with how Apple debuted the A4 chip: first in the original iPad, followed by the iPhone 4, and then the iPod touch 4th generation.)

Choosing the right processorsProcessors Functions

single core • Browse the internet• Check email• Play the occasional flash game

dual core or i3 • Do your word processing, spreadsheets etc. on your PC

• Listen to music often• Watch movies

dual core or i5 • Play the occasional games (Happy with lower resolution and lower quality graphics)• Watch HD movies

Quad core, i5, or i7

• Graphic publishing• Music creation• Programming (and compilation)• Watch HD movies• Play visually appealing games

i7 Extreme • The very best hardware • Play the most graphically intense games

Operating System (OS) O A set of programs that manage computer

hardware resources and provide common services for software applications.

O Types of OS: Batch Processing Operating System Single User Operating System Multi-Tasking Operating System Multi-User Operating System Distributed Operating System Real-time Operating System

Batch processing OSO Limited or no system interaction between the

user and processor during the execution of workO Data and programs that need to be processed

are bundled and collected as a ‘batch’ and executed together.

O Ideal in situations where:- There are large amounts of data to be processed.- Similar data needs to be processed.- Similar processing is involved when executing the data.

Single User OS

O A single user OS as the name suggests is designed for one user to effectively use a computer at a time.

Multi-Tasking OS

O Several applications maybe simultaneously loaded and used in the memory

O While the processor handles only one application at a particular time it is capable of switching between the applications effectively to apparently simultaneously execute each application.

O This type of operating system is seen everywhere today and is the most common type of OS, the Windows operating system would be an example.

Multi-User OS

O Allows multiple users to simultaneously use the system

O The processor splits its resources and handles one user at a time

O Fast and efficient (this makes it apparent that users are simultaneously using the system)

O Some network systems utilize this kind of operating system.

Distributed OS

O Software and data maybe distributed around the system, programs and files maybe stored on different storage devices which are located in different geographical locations and maybe accessed from different computer terminals.

O While we are mostly accustomed to seeing multi-tasking and multi-user operating systems, the other operating systems are usually used in companies and firms to power special systems.

Real-time OS

O Used to control machinery, control systems and industrial systems

O Have very less or (in certain case) no user-interface capability