Components For A Computer System Computer Science Essay

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Computer system is a combination of components designed to process and store data. It comprises at least one input device, a processing unit, an output device and a storage device and may contain a communication device. The components include CPU, buses, main memory (RAM and ROM) and peripherals. The most common form in which a modern computer is found today is called a Personal Computer. A computer system is always designed according to user requirements.

Computers are very useful for us in many ways. It is the best device to store data and keep back-up even when somebody has accidentally deleted it. It provides best communication results through internet. The number of computers and communication systems as telephone or faxes are being used are increasing more than ever, while managers are able to use applications like MS word and spreadsheets.

Computer systems are playing a very pivotal role in many fields like medical, Business, education, engineering etc. Now in this era computers have become so popular that we require them in our every day task such as documentation, gaming, chatting, shopping to having an online consultancy the vast use of computer system does not end after helping in our daily (routine) activities but also does many complex activities as large scale the inventory handling (Purchase order system designed by Wall-Mart), library system, surveillance systems etc.

Case Study:

An attendance system of London College of Accountancy, IT Department, calculates the attendance of the students and teachers using the thumb scanner device. Both students and teachers enter thumb impression while entering and leaving the class room. The thumb impression of every student and faculty member shall be stored within a device; enabling the system to check thumb impressions, if the thumb impression matches then attendance will be marked and this information will be sent to administrator in order to maintain the records and if it does not match than relevant action can be taken as imposition of fine or expelling a particular student for not attending the class as per the college rules. Administrator maintains the records, update, add, and delete the records according to the conditions and rules. At the end of the month he will generate the monthly report. This document is designed to discuss all the details, requirements, uses, and develop an understanding related to such computerized system.

Requirement Specification:

Below is the list of all the necessary components required to fulfill the minimum requirement for our computer system. The reason for displaying minimum is, in case we decide to upgrade our system in the future and expand its functions to implement it in other departments of university, it will be capable enough to handle that expansion.

Components for a computer system for particular users:


CPU (Central Processing Unit)





Teachers and Students


There are several companies that are manufacturing computer systems but Dell is one of the most reliable and economical in manufacturing computer systems. Dell is a multinational technology corporation that develops, manufactures, sells, and supports desktops, servers, notebooks, peripherals, printers, etc. There are many other companies in the market as well but we chose Dell as it is at top of the list. Due to there efficiency we have selected a system to discuss here, and the operating system that we will be used, and further we will discuss customized features of operating system.

Dell Studio Mini-Tower:

Processor: Intel® Pentium® dual-core E5400 (2MB L2, 2.7GHz, 800FSB)

Operating System: Genuine Windows® 7 Home Premium, 64bit, English

Monitor: 20" Dell ST2010-Black High Definition Monitor

Optical Drive: 16X DVD+/-RW Drive

Memory: 6GB Dual Channel DDR2 SDRAM at 800MHz-4DIMMs

Hard Drive: 640GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cacheâ„¢

Video Card: Integrated Intel® GMA X4500HD Graphics

Sound Card: Integrated 7.1 Channel Audio

Hardware Support Services: 1 Year Basic Service Plan

Price: $847

Dell Studio Slim:

Processor: Intel® Core™ 2 Quad Q8300 (4MB L2, 2.5GHz, 1333FSB)

Operating System: Genuine Windows® 7 Home Premium, 64bit, English

Monitor: 20" Dell ST2010-Black High Definition Monitor

Optical Drive: 16X DVD+/-RW Drive

Memory: 4GB Dual Channel DDR2 SDRAM at 800MHz-2DIMMs

Hard Drive: 750GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cacheâ„¢

Video Card: Integrated Intel® GMA X4500HD Graphics

Sound Card: Integrated 7.1 Channel Audio

Hardware Support Services: 2 Year Basic Service Plan

Price: $655

Dell Vostro 200 Mini-Tower Desktop:

Integrated Intel® Graphics Media Accelerator X3100

McAfee® Security Center™ 8-15 months English

Genuine Windows Vistaâ„¢ Ultimate

2 Year Limited Warranty

Microsoft Office 2007 Basic OEM Version-English

Dell USB Quietkey Keyboard

1GB (2*512MB) NECC Dual Channel DDR2 667MHz SDRAM Memory

19" Wide Screen Flat Panel LCD Monitor

Dell Optical USB Mouse

Integrated Fast Ethernet 10/100

16X DVD+/-RW with Dual Layer Write Capabilities

250GB SATA 3.0GB/s Hard Drive

Intel® Pentium™ Dual-Core Processor E2160

1.8GHz, 1MB L2 Cache, 800Mhz FSB

USB Fingerprint Scanner: BioMini:

Fingerprint Sensor: Optical (Scratch free sensor surface)

Resolution: 500DPI/256 gray

Sensing Area: 16 x 18 mm

Image Size: 288 x 288 pixel

Interface: USB 2.0 High speed/Full speed, Plug & Play

OS: Vista

Operation Temperature: -10 ~ 50°C

Weight: 190g

Dimension: 66 x 90 x 58 mm

Evaluate the performance of the system:

The above mentioned Dell Vostro 200 Mini-Tower Desktop computer system is selected for our system. It is analyzed that Dell Slim system is suitable according to our system requirements and user needs. It fulfills all the needs of our users and making them feel at an ease while using it. It can store heavy data of students' records and can efficiently manage that information. The processor speed, memory capacity, vision and supporting hardware is appropriate to our system requirements.

Contrast the functions and features of different type of Operating Systems:

Operating System:

"An operating system is a program that controls the execution of application programs and acts as an interface between applications and the computer hardware". It can be thought of as operating system does these three main tasks:

Provide Convenience: An operating system makes a computer more convenient to use.

Provide Efficiency: An operating system allows the computer system resources to be used in an efficient manner.

Provide ability to evolve: An operating system constructed in such a way as to permit the effective development, testing, and introduction of new system functions without interfering with service.

Almost all the computers as well as mobiles, portable media and domestic appliances use some type of operating system to fulfill their particular task.




Log Files

Centralized application Installation


Regular Release cycle

Root user

Pricing Installed applications

Hardware detection

Windows XP:

Windows XP has very quick start and hibernation sequence.

Remote desktop functions of Windows XP are useful functions that facilitates to connect the running Windows XP Pro of your computer from across a network or also the internet.

Digital photography is the best feature in XP that allows you to transfer pictures directly from your digital cameras to your computer systems.

Game for windows provides a wide range of vision and other adventure. Windows XP also offers Windows Movie Maker system,

Ease of communication with your friends and other family members in the entire world with Windows Messenger using Widows Live ID.

All your data and other essential files are very safe and sound through Windows XP.

Windows Vista:

The interface of Windows Vista is user friendly, interface is said to be state of art and has been called Aero.

Vista is a reach for new standards in OS, providing an all new, user friendly experience with a one click access speed up operations.

Vista provides you automatic backup on your computer.

Vista allows you to make movie from files or camera.

The internet explorer is expected to have a new interface, search box, easy printing and other functions.

If you want to access your operating system while it is shut down from you mobiles or handheld devices than Windows Vista is the best choice.

Multiple language and speech recognition system in Windows vista are to be experienced.

Vista now is being restored in order to provide better manipulating by Task manager and task scheduler.

Vista includes version 3.0 of the .NET Framework, allowing software developers to write applications without traditional Windows APIs.

Windows 7:

Windows 7 the first Windows release which is compatible even with the hardware with which its predecessors were not.

The startup button search facility introduced with Windows Vista has been given a smart that makes it an authentic timesaver. Instead of only looking for an exact filename, the search can be done in a more intelligent manner.

Now Windows 7 allows Windows Explorer to add network folders, SharePoint Documents, an email search and find that file within a few clicks.

The drag and snap windows function is very useful in Windows 7 because of wide screen, drag one window to far left and other to right.

The restored Show Desktop button, which now occupies the few remaining pixels between the System Tray Clock and the right edge of the Taskbar, makes all open Windows transparent when you place the mouse over the icon.

Selected Operating System: Windows Vista:

According to user convenient here the selected operating system is Microsoft Windows Vista. Windows Vista is a very easy to adopt and its graphical user interface is very user friendly. It has many professional features as well e.g. 3.0 .NET Framework. The users of this system feel comfortable with this operating system.

Customize the Operating System:

Every operating system have got there own functionalities which user can customize according to their choice and also their requirements. You can also customize the settings of Microsoft Windows Vista very easily and conveniently.

Windows Task Bar Settings:

Click right button of mouse on the empty space on taskbar and then select properties. Then the user can change taskbar settings according to his requirements. After customize the settings click OK to save changes and Cancel to remain the previous settings.

Windows Start Menu Settings:

To change the settings of Start Menu go to Control Panel and then select start menu tab, choose the option of sleeker Vista settings of start menu or chose classic settings of start menu, can also remove item from start menu, after made changes click OK to save changes and Cancel to remain the previous settings.

Desktop Settings:

Right click on desktop empty space and then clicks on properties to set desktop properties like desktop theme, desktop background, screen saver, appearance etc. and then click OK button to save the changes.

Desktop Theme:

Desktop theme can be by clicking on theme tab in desktop properties dialog box. One can download new themes from Windows website also.

Desktop Background/Wallpaper:

Desktop background can be select or change by selecting Desktop tab in desktop properties dialog box. One can download new wallpapers from Windows website also and even from any file in the system.

Windows Screen Saver:

Windows Screen Saver can be select or change by selecting Desktop tab in desktop properties dialog box. One can download new windows screen savers from Windows website also.

Customize Desktop:

Customize Desktop allows the user to hide or show the standard windows desktop icons.

Appearance Settings:

Now click on Appearance tab in properties dialog box, this will allows the user to alter the color scheme and fonts for the Windows Vista. User can personally customize the appearance of Windows, create own style. After alter the settings click OK to customize settings and see the effect of saved changes by changing the systems view.

Shutting Down System:

Click on Start button and then click on Turn Off button to shut down the system properly and safely.

Specify a Computer System to suit a given task:


Dell System

Case type

Vostro 200 Mini-Tower Desktop


Intel® Core™ 2

Operating System

Genuine Windows Vistaâ„¢ Ultimate


19" Wide Screen Flat Panel LCD

Optical Drive

16X DVD+/-RW Drive


1GB Dual Channel

Hard Drive

750GB Serial ATA Hard Drive

Video Card

Integrated Intel® Graphics Media X3100

Security Software

McAfee® Security Center™







Application Software

MS office, Outlook, Internet browsing

Fingerprint Scanner

USB BioMini Optical Fingerprint Scanner

Hardware Support Services

2 Year Limited Warranty

Checking of main hardware and software components using standard techniques:

There are two types of testing:

Black box testing

White box testing

Black box and white box are tests designed models. Black box test design treats the system as a "black-box", so it doesn't explicitly use knowledge of the internal structure. It is usually described as focusing on testing functional requirements. White box test design allows one to look inside the "box", and it focuses specifically on using internal knowledge of the software to guide the selection of test data.

Test Performed


Test Results

Turning ON System

Power button worked and about after 3 minutes windows loaded.


Keyboard Test

Open MS Access and enter some data in tables from keyboard


Mouse Test

Test mouse by click on close button in MS Access


Printer Test

Test printer by send some data to printer


Access Database opening Test

Open MS Access and save some data in tables


Fingerprint Scanner Test

Put someone's finger on it and see image of it in system's monitor


Turning OFF System

Click on Turn Off button in start menu





Mouse is not working frequently.

Should be some dirt in it.

open the back of mouse and

Key board is not working

Port should be lose

Switch in the port properly.

Fingerprint scanner can't recognize the image

It may due to season change

Take another image of finger

Health and safety requirements:

Health and safety issues are of paramount importance, system is tested before it is handed over to the user. Deploy the system properly at the working place. All the components must be working properly when user starts working. In the situation if any problem occurs, technical person must be available for service.

Produce security policy for system:

There must be a sound security policy for the system to run in a better way and prevent from unauthorized access. The security policy is:

Use passwords to prevent from unauthorized access

Use network firewalls which help to prevent any hacker enter in the network.

Computer system must be kept in cool room

Not eatables are places near computer system

System should be start and shut down properly

All the support hardware must be use properly.

Any software and hardware problem occur must consult with technical person.


Dell Vostro 200 Mini-Tower Desktop computer system is the best solution according to our requirement it's a cost effective and best for our future requirements also if we want to expand our system. Dell would be the main supplier of the hardware and ensure hardware maintenance efficiently.

The software like security software (McAfee), database software (Microsoft Access) are most reliable software's for our required system.