Hardwares of Personal Computers1 Hardware of Personal Computers Topic 4

Hardwares of Personal Computers2 Part 1: Introduction

Hardwares of Personal Computers3 What are Basic Hardware of a Personal Computer? 1.Monitor 2.Motherboard 3.CPU (Microprocessor) 4.Primary storage (RAM) 5.Expansion cards 6.Power supply 7.Optical disc drive 8.Secondary storage (Hard disk) 9.Keyboard 10.Mouse Figure 1. Basic hardware of a PC. (Wikipedia, 2007a)

Hardwares of Personal Computers4 What is a Hardware? Hardware is the general term that is used to describe physical artifacts of a technology.

Hardwares of Personal Computers5 Classification of Hardware Input Devices 1 Processing Unit 2 Storage Devices 3 Output Devices 4 Figure 2. Classification of Hardware. Key: Data flow

Hardwares of Personal Computers6 Part 2: Input Devices

Hardwares of Personal Computers7 What is an Input Device? A hardware mechanism that transforms information in the external world for consumption by a computer. (Wikipedia 2007b)

Hardwares of Personal Computers8 Input Devices Keyboard for the input of text and characters and also to control the operation of a computer (Wikipedia 2007c) Mouse a pointing device by detecting two- dimensional motion relative to its supporting surface. (Wikipedia 2007d) Scanner a device that analyzes images, printed text, or handwriting, or an object and converts it to a digital image (Wikipedia 2007e)

Hardwares of Personal Computers9 Input Devices Microphone an acoustic to electric transducer or sensor that converts sound into an electrical signal. (Wikipedia, 2007f) WebCam a real-time camera (usually, though not always, a video camera) whose images can be accessed using the World Wide Web (Wikipedia, 2007g) Digital Camera an electronic device used to capture and store photographs electronically in a digital format (Wikipedia, 2007h)

Hardwares of Personal Computers10 Part 3: Processing Unit

Hardwares of Personal Computers11 What is a Processing Unit? A central processing unit (CPU), is the component in a digital computer that interprets computer program instructions and processes data. (Wikipedia, 2007i) There are 2 major CPU manufacturers for personal computers. Intel AMD Figure 3. Intel Celern 2.66GHz CPU (Front) Figure 4. Intel Celern 2.66GHz CPU (Back)

Hardwares of Personal Computers12 How fast is a CPU? When you choose a CPU, you should consider its speed. The speed of a CPU is determined by 2 main factors. –Clock frequency –Amount of cache memory The higher the value, the faster the CPU will be. The clock frequency of a CPU Figure 5. The clock frequency of a CPU.

Hardwares of Personal Computers13 What are Intel CPU Families for Desktop Computers? There are 3 Intel CPU families for desktop computers: 1.Core Processor Pentium Processor Celeron

Hardwares of Personal Computers14 What are AMD CPU Families for Desktop Computers? There are 3 AMD CPU Families for Desktop Computers: 1.Athlon 64 FX en/Processors/ProductInformation/0,,30_118_9485_9488,00.html en/Processors/ProductInformation/0,,30_118_9485_9488,00.html 2.Athlon 64 x 2 Dual – Core en/Processors/ProductInformation/0,,30_118_9485_13041,00.html en/Processors/ProductInformation/0,,30_118_9485_13041,00.html 3.Athlon 64 en/Processors/ProductInformation/0,,30_118_9485_9487,00.html en/Processors/ProductInformation/0,,30_118_9485_9487,00.html

Hardwares of Personal Computers15 TASK 1 (Individual work) You have learnt some searching skills for search engines, now you need to search the basic configurations and prices of the following CPUs. Please complete TABLE 1 and post it in the forum.

Hardwares of Personal Computers16 TASK 1 (TABLE 1) Intel CPUAMD CPU CPU ModelCore 2 Due E6700 Celeron D356 Athlon 64 FX – 51/940 Athlon 64 ADA CN Clock Frequency (GHz) Cache Memory L2 (MB) Price (HK$)

Hardwares of Personal Computers17 TASK 2 (Group Work) You are divided into groups of 4. Discuss the above CPU models, which are suitable for home PC or office PC used. Give brief reasons. Please post your group discussion results in the forum.

Hardwares of Personal Computers18 What is a motherboard? A motherboard is the central circuit board making up a personal computer. (Wikipedia, 2007j) Figure 6. A motherboard. CPU RAM slot

Hardwares of Personal Computers19 Motherboard A personal computer is built with the CPU, main memory, and other essential components on the motherboard. Other components such as external storage, controllers for video display and sound, and peripheral devices are typically attached to the motherboard via edge connectors and cables. In modern computers it is increasingly common to integrate these "peripherals" into the motherboard.

Hardwares of Personal Computers20 What is a Video Card? A video card is to generate and output images to a display. (Wikipedia, 2007k) Figure 7. A video card.

Hardwares of Personal Computers21 A Video Card If the video card is integrated in the motherboard, it will use the computer RAM memory (lower throughput). If it is not integrated, the video card will have its own video memory which is called Video RAM or VRAM. The VRAM capacity of most modern video cards range from 128 to 2048 MB (workstation graphics cards). In 2006, the VRAM was based on DDR technology, standing out DDR2, GDDR3 and GDDR4. The memory clock rate is between 400 MHz and 1.6 GHz. A very important element of the video memory is the Z- buffer, which manages the depth coordinates in 3D graphics. (Wikipedia, 2007k)

Hardwares of Personal Computers22 What is a Sound Card? A sound card is a computer expansion card that can input and output sound under control of computer programs. Many computers have sound capabilities built in on the motherboard, while others require these expansion cards if audio capability is desired. (Wikipedia, 2007l) Figure 8. A sound card.

Hardwares of Personal Computers23 Part 4: Storage Devices

Hardwares of Personal Computers24 What are Types of Storage Devices? Storage Devices Primary Storage Read-Only Memory (ROM) Random-Access Memory (RAM) Secondary Storage Figure 9. Classification of storage devices.

Hardwares of Personal Computers25 What is Primary Storage? Primary storage is computer memory that is directly accessible to the CPU of a computer without the use of computer's input/output channels. Primary storage is used to store data that is likely to be in active use. (Wikipedia, 2007m)

Hardwares of Personal Computers26 What is ROM? Read-only memory (ROM) is a class of storage media used in computers. Data stored in ROM cannot be modified. ROM is a non-volatile storage. Data remains unchanged even after switching off the computer. (Wikipedia, 2007n) E.g. EPROM, EEPROM Figure 10. An EPROM. (Wikipedia, 2007n)

Hardwares of Personal Computers27 What is RAM? Random access memory (RAM) is a type of data storage used in computers. It takes the form of integrated circuits that allow the stored data to be accessed in any order (random). Data stored in RAM can be modified. RAM is a volatile storage. Data will lose after switching off the computer. (Wikipedia, 2007o) E.g. DDRam, DDR-2 Ram Figure 11. Two 512 MB DDRam.

Hardwares of Personal Computers28 What is Secondary Storage? Secondary storage is computer memory that is not directly accessible to the CPU of a computer, requiring the use of computer's input/output channels. It is used to store data that is NOT in active use. It is usually slower than primary storage but it always has higher storage capacity. It is non-volatile. Data remains unchanged even after switching off the computer. (Wikipedia, 2007p)

Hardwares of Personal Computers29 Secondary Storage 3.5” Floppy Disk Data can be read or write Data capacity: 1.44 MB (Wikipedia, 2007q) Figure 12. A floppy disk.

Hardwares of Personal Computers30 Secondary Storage Hard Disk Data can be read or write Speed of disk rotation usually 7200 rpm Data capacity : 80GB, 160GB, 250GB, 300GB etc (Wikipedia, 2007r) Figure 13. A Hard disk.

Hardwares of Personal Computers31 Secondary Storage CD-RomCD-RCD-RW Data can be Read onlyRead but write once Read & write Data capacity (MB) 650

Hardwares of Personal Computers32 Secondary Storage DVDDVD-R /DVD+R DVD-RW /DVD+RW Data can be Read onlyRead but write once Read & write Data capacity (GB) Single layer: 4.7 Double layer: 8.5 Single layer: 4.7 Double layer: 8.5 Single layer: 4.7 Double layer: 8.5

Hardwares of Personal Computers33 What are the Different Between DVD-R and DVD+R? The DVD-R format was developed by Pioneer in the autumn of It is supported by most DVD players, and is approved by the DVD Forum. (Wikipedia, 2007s) DVD+R was developed in This format is a competing format to the DVD-R format, which is developed by the DVD Forum, it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format. (Wikipedia, 2007t)

Hardwares of Personal Computers34 Secondary Storage Figure 14. A C-R disk. Figure 15. A CD-RW disk.

Hardwares of Personal Computers35 Secondary Storage Figure 16. A DVD-R disk. Figure 17. A DVD+RW disk.

Hardwares of Personal Computers36 Secondary Storage USB flash drives They are flash memory data storage devices integrated with a USB interface. They are typically small, lightweight, removable and rewritable. (Wikipedia, 2007u) Data capacity: 512MB, 1GB, 2GB, 4GB, etc Figure 18. An USB flash drive.

Hardwares of Personal Computers37 Secondary Storage Memory Cards e.g. SD card, CF card, xD card, Microdrive, Memory Stick Data can be read or write Data capacity: 512 MB, 1GB, 2GB, 4GB etc Figure 19. A SD card.

Hardwares of Personal Computers38 Various Types of Memory Cards SM CardSD CardCF Card xD cardMemory StickMicrodrive Figure 20. Various types of memory cards.

Hardwares of Personal Computers39 Part 5: Output Devices

Hardwares of Personal Computers40 What is an output device? Output devices include any hardware that translate information processed by the computer into a form that humans can understand.

Hardwares of Personal Computers41 Output Devices A monitor is a piece of electrical equipment which displays texts and images. It generated a temporary record because the record disappear when power off. There are 2 major types of monitors: Cathode Ray Tube (CRT) and Liquid Crystal Display (LCD) (Wikipedia, 2007v) Figure 21. A 14” LCD monitor.

Hardwares of Personal Computers42 The performance parameters of a monitor are: 1.Luminance 2.Size, measured diagonally For CRT the viewable size is one inch smaller then the tube itself. 3.Dot pitch Describes the distance between pixels of the same color. In general, the lower the dot pitch (e.g. 0.24), the sharper the picture will appear.

Hardwares of Personal Computers43 4.Response time The amount of time a pixel in an LCD monitor takes to go from active (black) to inactive (white) and back to active (black) again. It is measured in milliseconds (ms). Lower numbers mean faster transitions and therefore fewer visible image artifacts. 5.Refresh rate The number of times in a second that a display is illuminated. 6.Power consumption 7.Display resolution The number of distinct pixels in each dimension that can be displayed.

Hardwares of Personal Computers44 Output Devices A printer produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper. There are 2 major types of printers. They are inject printer and laser printer. The resolution of a printer is measured in dots per inch (dpi). The higher the value, the better the quality. (Wikipedia, 2007w)

Hardwares of Personal Computers45 Output Devices Inkjet printers operates by propelling tiny droplets of liquid ink onto paper. They are the most common type of computer printer for the general consumer due to their low cost, high quality of output, capability of printing in vivid colour, and ease of use. (Wikipedia, 2007x) Figure 22. An HP Inkjet K5400dn printer. (HP, 2007a)

Hardwares of Personal Computers46 Output Devices Laser printer Laser printers employ a xerographic printing process. Laser printers are available in both colour and black & white varieties. (Wikipedia, 2007y) Figure 23. An HP LaserJet 1022 printer. (HP, 2007b)

Hardwares of Personal Computers47 Task 3 (Group Work) You are divided into groups of 4. Select ONE laser printer and ONE inkjet printers Compare the features (print speed, print volume per month, print resolution, printer price, print cost per page) of the laser printer and the inkjet printer. Please post your group discussion results in the forum.

Hardwares of Personal Computers48 Output Devices A loudspeaker is an electromechanical transducer which converts an electrical signal into sound. (Wikipedia, 2007z) Figure 24. Loudspearkers

Hardwares of Personal Computers49 References HP. (2007a). HP Officejet Pro K5400dn. Retrieved July 7, 2007, from html HP. (2007b). HP Olaser Jet Retrieved July 7, 2007, from Wikipedia. (2007a). Personal Computer. Retrieved July 7, 2007, from Wikipedia. (2007b). Input Device. Retrieved July 7, 2007, from Wikipedia. (2007c). Computer Keyboard. Retrieved July 7, 2007, from Wikipedia. (2007d). Mouse (Computing). Retrieved July 7, 2007, from Wikipedia. (2007e). Image Scanner. Retrieved July 7, 2007, from Wikipedia. (2007f). Microphone. Retrieved July 7, 2007, from Wikipedia. (2007g). Webcam. Retrieved July 7, 2007, from Wikipedia. (2007h). Digital Camera. Retrieved July 7, 2007, from Wikipedia. (2007i). Central Processing Unit. Retrieved July 7, 2007, from Wikipedia. (2007j). Motherboard. Retrieved July 7, 2007, from Wikipedia. (2007k). Video Card. Retrieved July 7, 2007, from Wikipedia. (2007l). Sound Card. Retrieved July 7, 2007, from

Hardwares of Personal Computers50 References Wikipedia. (2007m). Primary Storage. Retrieved July 7, 2007, from Wikipedia. (2007n). Read-only Memory. Retrieved July 7, 2007, from Wikipedia. (2007o). Random Access Memory. Retrieved July 7, 2007, from Wikipedia. (2007p). Secondary Storage. Retrieved July 7, 2007, from Wikipedia. (2007q). Floppy Disk. Retrieved July 7, 2007, from Wikipedia. (2007r). Hard Disk Drive. Retrieved July 7, 2007, from Wikipedia. (2007s). DVD-R. Retrieved July 7, 2007, from Wikipedia. (2007t). DVD+R. Retrieved July 7, 2007, from Wikipedia. (2007u). USB Flash Drive. Retrieved July 7, 2007, from Wikipedia. (2007v). Computer Display. Retrieved July 7, 2007, from Wikipedia. (2007w). Computer Printer. Retrieved July 7, 2007, from Wikipedia. (2007x). Inkject Printer. Retrieved July 7, 2007, from Wikipedia. (2007y). Laser Printer. Retrieved July 7, 2007, from Wikipedia. (2007z). Loudspeaker. Retrieved July 7, 2007, from