HP




The Hewlett-Packard Company commonly referred to as HP, is a technology corporation headquartered in Palo Alto, California, United States. HP is the largest technology company in the world and operates in nearly every country. HP specializes in developing and manufacturing computing, storage, and networking hardware, software and services. Major product lines include personal computing devices, enterprise servers, related storage devices, as well as a diverse range of printers and other imaging products. Other product lines, including electronic test equipment and systems, medical electronic equipment, solid state components and instrumentation for chemical analysis were spun off as Agilent Technologies in 1999.
HP markets its products to households, small to medium size businesses and enterprises both directly, via online distribution, consumer-electronics and office-supply retailers, software partners and major technology vendors.
HP posted US $91.7 billion in annual revenue in 2006 compared to US$91.4 billion for IBM, making it the world's largest technology vendor in terms of sales. In 2007 the revenue was $104 billion, making HP the first IT company in history to report revenues exceeding $100 billion.[5]
HP is the largest worldwide seller of personal computers, surpassing rival Dell, according to market research firms Gartner and IDC reported in January 2008; the gap between HP and Dell widened substantially at the end of 2007, with HP taking a near 3.9% market share lead. HP is also the 5th largest software company in the world.

SAP TECHNOLOGIES




SAP was founded in the year 1972 as Systemanalyse und Programmentwicklung ("System Analysis and Program Development") by five former IBM engineers in Mannheim, Baden-Württemberg (Dietmar Hopp, Hans-Werner Hector, Hasso Plattner, Klaus E. Tschira, and Claus Wellenreuther).
As part of the Xerox exit strategy from the computer industry, Xerox retained IBM to migrate their business systems to IBM technology. As part of IBM's compensation for the migration, IBM acquired the SDS/SAPE software, reportedly for a contract credit of $80,000. The SAPE software was given by IBM to the founding ex-IBM employees in exchange for founding stock provided to IBM, reportedly 8%. It may be noted that, at the time they left IBM, the ex-employees were quite senior engineers in IBM Germany rather than founding engineers in the sense of Hewlett-Packard's founders.ICI was SAPs first ever Customer in Germany in 1972.
SAP BABOONCH is now available as an ERP BOONCH Suite
The acronym was later changed to stand for Systeme, Anwendungen und Produkte in der Datenverarbeitung ("Systems, Applications and Products in Data Processing").
In 1976 "SAP GmbH" was founded and the following year it moved headquarters to Walldorf. SAP AG became the company's official name after the 2005 annual general meeting (AG is short for Aktiengesellschaft).
In August 1988, SAP GmbH transferred into SAP AG (a corporation by German law), and public trading started November 4. Shares are listed on the Frankfurt and Stuttgart stock exchange.[4]
Four of the founding members -- Hopp, Plattner, Tschira and Hector -- form the executive board. In 1995, SAP was included in the German stock index DAX. On September 22, 2003, SAP was included in the Dow Jones STOXX 50.[5] In 1991, Prof. Dr. Henning Kagermann joined the board; Dr. Peter Zencke became a board member in 1993.[6] Claus Heinrich,[7] and Gerhard Oswald [8] have been members of the SAP Executive Board since 1996. Two years later, in 1998, the first change at the helm took place. Dietmar Hopp and Klaus Tschira moved to the supervisory board and Dietmar Hopp was appointed Chairman of the supervisory board. Henning Kagermann was appointed as Co-Chairman and CEO of SAP next to Hasso Plattner. Werner Brandt joined SAP in 2001 as a member of the SAP Executive Board and Chief Financial Officer.[9] Léo Apotheker has been a member of the SAP Executive Board and president of Global Customer Solutions & Operations since 2002, was appointed Deputy CEO in 2007, and then became co-CEO alongside Kagermann in 2008.
Henning Kagermann became the sole CEO of SAP in 2003. In February 2007 his contract was extended until 2009. After continuous disputes over the responsibility of the development organization, Shai Agassi, a member of the executive board who had been named as a potential successor to Kagermann, left the organization. In April 2008, along with the announcement of Leo Apotheker as co-CEO, the SAP supervisory board also appointed to the SAP Executive Board three new members, effective July 1, 2008: Corporate Officers Erwin Gunst, Bill McDermott and Jim Hagemann Snabe.

ORACLE


The Oracle Database (commonly referred to as Oracle RDBMS or simply Oracle) consists of a relational database management system (RDBMS) produced and marketed by Oracle Corporation. As of 2008[update], Oracle had become a major presence in database computing
Larry Ellison and his friends and former co-workers Bob Miner and Ed Oates started the consultancy Software Development Laboratories (SDL) in 1977. SDL developed the original version of the Oracle software. The name Oracle comes from the code-name of a CIA-funded project Ellison had worked on while previously employed by Ampex

MICROSOFT COMPANY




Microsoft Corporation is a multinational computer technology corporation that develops, manufactures, licenses, and supports a wide range of software products for computing devices.[9][8] Headquartered in Redmond, Washington, USA, its best selling products are the Microsoft Windows operating system and the Microsoft Office suite of productivity software.
Originally founded to develop and sell BASIC interpreters for the Altair 8800, Microsoft rose to dominate the home computer operating system market with MS-DOS in the mid-1980s, followed by the Windows line of operating systems. Its products have all achieved near-ubiquity in the desktop computer market. One commentator notes that Microsoft's original mission was "a computer on every desk and in every home, running Microsoft software"—it is a goal near fulfillment.[10] Microsoft possesses footholds in other markets, with assets such as the MSNBC cable television network, the MSN Internet portal, and the Microsoft Encarta multimedia encyclopedia. The company also markets both computer hardware products such as the Microsoft mouse as well as home entertainment products such as the Xbox, Xbox 360, Zune and MSN TV.The company released an initial public offering (IPO) in the stock market, which, due to the ensuing rise of the stock price, has made four billionaires and an estimated 12,000 millionaires from Microsoft employees.
Throughout its history the company has been the target of criticism, including monopolistic business practices and anti-competitive business practices including refusal to deal and tying. The U.S. Justice Department and the European Commission, among others, have ruled against Microsoft for various antitrust violations.
Known for what is generally described as a developer-centric business culture, Microsoft has historically given customer support over Usenet newsgroups and the World Wide Web, and awards Microsoft MVP status to volunteers who are deemed helpful in assisting the company's customers

HTC TOUCH PRO


Software and Features
Operating System
Windows Mobile 6.1; Professional
Microsoft Outlook Mobile
Yes
Microsoft Office Mobile
Yes (Includes Microsoft Office Word Mobile, Excel Mobile, Powerpoint Mobile, OneNote Mobile)
Microsoft Internet Explorer Mobile
Yes
Direct Push E-Mail
Yes
Windows Media Player
Yes
Voice Recognition
Microsoft Voice Command
Windows Live for Windows Mobile
Windows Live
Live Search
Yes
Hardware
Processor
528 MHz Qualcomm MSM7501A
Dimensions
4" (H) x 2" (W) x 0.7" (D)
Weight
5.3 ounces
Display resolution
480x640
QWERTY keyboard
Yes
Touch/Non-touch
Touch Screen with Stylus
Camera
Yes (3.2-MP color CMOS digital camera with auto-focus and video mode and flash light)
Built-in memory
288 MB RAM; 512 MB ROM
Expandable memory
Micro SD
Battery Life
Up to 4 hours talk time, up to 14 days standby time
Speakerphone
Yes
Internal GPS
Yes
Connectivity
Bluetooth
Stereo Bluetooth 2.0 + Enhanced Data
Wi-Fi
Yes
Infrared
No
3G
Yes
Networks
CDMA; GSM 850; GSM 1900; 1xRTT; EVDO; EVDO Rev A; HSDPA 850; HSDPA 1900

HTC G1



Carrier: T-Mobile
Technology: 3G US T-Mobile Standard, Quad Band 850/900/1800/1900
Feature: 3+ Megapixel Camera, Bluetooth, Calendar, Camera, Candy Bar Form, Email Client, FM Radio, GPS / Location, High-Speed Data GPRS, Megapixel Camera, Memory Card Slot, MP3, Qwerty Keyboard, Smartphone, Touch Screen, Video Clip, Wi-Fi
Click here for Similar Product
Weight: 5.6 oz
Talk Time: Up to 406 minutes
Stand By Time: Up to 319 hours
Product Includes T-Mobile G1 Android HTC Smartphone Bronze
Product Overview
The long-awaited HTC Dream, the first commercial handset running Google's Android operating system, will be coming to T-Mobile as the G1, Featuring a 3-inch touchscreen, internet navigation buttons and a full QWERTY keypad, the smartphone market has finally broken free of Symbian, Windows Mobile and the sweet clutches of fruit companies
.

SAMSUNG M7500



Carrier: AT&T (GSM based), T-Mobile, and Other GSM carriers** Please check compatibility with your service provider
Technology: 3G EURO Standard, Quad Band 850/900/1800/1900
Feature: 3+ Megapixel Camera, A2DP, Bluetooth, Calendar, Camera, Candy Bar Form, Edge, Email Client, FM Radio, High-Speed Data GPRS, Megapixel Camera, Memory Card Slot, MP3, Speaker Phone, Video Capture, Video Clip

LG INCITE





Software and Features
Operating System
Windows Mobile 6.1; Professional
Microsoft Outlook Mobile
Yes (Includes contacts, calendar, tasks, e-mail, text messaging)
Microsoft Office Mobile
Yes (Includes Microsoft Office Word Mobile, Excel Mobile, OneNote Mobile, and PowerPoint Mobile)
Microsoft Internet Explorer Mobile
Yes
Direct Push E-Mail
Yes
Windows Media Player
Yes
Voice Recognition
Microsoft Voice Command
Windows Live for Windows Mobile
No
Live Search
Available as Download
Hardware
Processor
528 MHz Qualcomm MSM7201A
Dimensions
4.2" (H) x 2.2" (W) x 0.6" (D)
Weight
3.2 ounces
Display resolution
240x400
QWERTY keyboard
Yes
Touch/Non-touch
Touch Screen with Stylus
Camera
Yes (3.0 MP camera/camcorder with panoramic ability. AT&T Video Share)
Built-in memory
128 MB RAM; 256 MB ROM
Expandable memory
Micro SD (up to 32GB)
Battery Life
Up to 8.6 hours talk time, up to 21 days standby time
Speakerphone
Yes
Internal GPS
Yes
Connectivity
Bluetooth
Bluetooth Version 2.0 (802.11 b/g)
Wi-Fi
Yes
Infrared
No
3G
Yes
Networks
GSM 850; GSM 900; GSM 1800; GSM 1900; HSDPA 3.6; HSDPA 850; HSDPA 1900; HSDPA 2100

BLACKBERRY


The BlackBerry is a wireless handheld device introduced in 1999 as a two-way pager. The more commonly known smartphone BlackBerry, which supports push e-mail, mobile telephone, text messaging, internet faxing, web browsing and other wireless information services, was released in 2002. It is an example of a convergent device. Developed by the Canadian company Research In Motion (RIM), it delivers information over the wireless data networks of mobile phone service companies. BlackBerry first made headway in the marketplace by concentrating on e-mail. RIM currently offers BlackBerry e-mail service to non-BlackBerry devices, such as the Palm Treo, through the BlackBerry Connect software. The original BlackBerry device had a monochrome display, but all current models have color displays.
While including PDA applications (address book, calendar, to-do lists, etc.) as well as telephone capabilities on newer models, the BlackBerry is primarily known for its ability to send and receive e-mail wherever it can access a wireless network of certain cellular phone carriers. It has a built-in QWERTY keyboard, optimized for "thumbing", the use of only the thumbs to type. System navigation is primarily accomplished by a scroll ball in the middle of the device (older devices used a track wheel on the side). Some models (currently, those manufactured for use with iDEN networks such as Nextel and Telus) also incorporate a Push-to-Talk (PTT) feature, similar to a two-way radio.
Modern BlackBerry handhelds incorporate an ARM 7 or 9 processor, while older BlackBerry 950 and 957 handhelds used Intel 80386 processors. The latest GSM BlackBerry models (8100, 8300 and 8700 series) have an Intel PXA901 312 MHz processor, 64 MB flash memory and 16 MB SDRAM. CDMA BlackBerry smartphones are based on Qualcomm MSM6x00 chipsets which also include the ARM 9-based processor and GSM 900/1800 roaming (as the case with the 8830). The devices are very popular with some businesses, where they are primarily used to provide e-mail access to roaming employees. To fully integrate the BlackBerry into a company's systems, the installation of BlackBerry Enterprise Server (BES) is required.
On 25 Sep 2008, RIM announced the number of BlackBerry subscribers has reached approximately 19 million.

AMD


Advanced Micro Devices, Inc. is an American multinational semiconductor company based in Sunnyvale, California, that develops computer processors and related technologies for commercial and consumer markets. Its main products include microprocessors, motherboard chipsets, embedded processors and graphics processors for servers, workstations and personal computers, and processor technologies for handheld devices, digital television, and game consoles.
AMD is the second-largest global supplier of microprocessors based on the x86 architecture after Intel Corporation, and the third-largest supplier of graphics processing units. It also owns 21 percent of Spansion, a supplier of non-volatile flash memory. In 2007, AMD ranked eleventh among semiconductor manufacturers in terms of revenue.

E62



General features
Announced in 2006
eGSM 850/900/1800/1900
Battery type 1500 mAh Li-Ion (BP-5L)
Battery life:
standby mode from 4 up to 7 hours
standby mode from 9 up to 11 days
Graphical high-contrast display, 2,8'', 16М colours (TFT), the resolution of 240x320 pixels (QVGA)
CPU: 235 MHz
Run by Symbian OS version 9.1 (interface Platform 60 ver 3.0)
Weight: 144 gramms
Dimensions: 117 x 69.7 x 14 mm
Memory
90 MB of memory are dynamically shared among the phonebook, calendar, messages, images and applications
RAM: 32 MB
mini-SD connector, hot card change
Photos for names in the phonebook
A Name and Surname (two lines), Company Name, Mobile phone number, Fax and E-mail address for a name - 8 fields. Althoug, you can add some more fields.
User groups - unlimited number, one name can refer to several groups at once.
SIM card entries are stored separately, you can't view them with internal memory
No limits on the number of entries in call lists, besides date and duration of the call you can add its type. You can set storage period for call entries (a month by default)
Call management, ringing tones
Vibracall
Polyphonic call melodies, True Tones, AAC, eAAC+, MP3, RealAudio, WAV
64-tones call signal, MP3, AAC, WAV, NB-AMR, WB-AMR
Voice dialing, no need in preliminary records
Speakerphone
Call duration is displayed during a conversation.
Assign own melodies to names
SMS
Predictive text input Т9
Message templates (10 preset, you can add or change present ones)
Sending and receiving graphical messages
Concatenated messages (up to 459 characters)
Connectivity
WAP 2.0
Bluetooth v.1.2
WLAN
IrDA
HSCSD
GPRS class 10
EGPRS (Class B, Multislot class 10)
HTML, xHTML, cHTML
E-mail protocols: SMTP, POP3, IMAP4
cервиcов: Good, MS Direct Push, BlackBerry Connect, XpressMail
MS ActiveSynch
MMS
Synchronization with PC
SyncML
SMIL
USB 2.0 via Pop-Port
PoC or PTT
Instant Messaging
Organizer and extras
User profiles, temporary profile
Time, date
Calculator, currency converter
Stopwatch (up to 20 intermediate values), countdown timer
Organizer with support for various kinds of events, reinders
To-do list
Dictaphone (records during a conversation)
3GPP Video Streaming
RealOne Player: RealMedia and 3GPP-compatible files
Photo album - advanced gallery
Special applications for viewing and editing MS Word, MS PowerPoint, MS Exel files
PDF
MP3 player
MIDP JavaTM (2.0), 3D API (JSR-184)
Upload Java aplications
Games

AXUA Zxi



General features
Model - 2008, June
GSM 850/900/1800/1900, UMTS 850/1900/2100
OS - Windows Mobile 6.1 Professional
CPU - TI OMAP 2431 450 MHz+ EMP U360
Display - 2.8" touchscreen, TFT, 320x240 pixels, up to 65K colors
Battery type - Li-ion 1100 mAhTalk time - up to 5 hours in GSM, up to 3 hours in UMTS, standby time - up to 200 hours
Weight - 119 g
Dimensions - 115.6 x 59.4 x 13.2 mm
Memory
256 MB internal memory
128 MB RAM
Slot for MicroSD (SDHC) cards
Call management
Vibrating alert
128-channel polyphony
MP3 for incoming calls
Loud speaker
Video calls
SMS
Т9 predictive text inputSMS, MMS, Email, MSN, Push E-mail
Camera
Built-in 3.0-megapixel camera
Frontal VGA-camera for video calls
Multimedia
JAVA MIDP2.0 + CLDC 1.1
Games
Audio formats - MP3, WMA, 3GP, AAC, AAC+
Image formats - JPEG, PNG, GIF, BMP
Connectivity
EDGE Class 10
GPRS Class 10
Bluetooth 2.0+EDR
USB 2.0
MiniUSB
Wi-Fi 802.11b/g
GPS
WAP 2.0/HTTP
PC sync (USB)
Organizer and extras
EziMusic
EziPhoto
MultiHome
NewStation
Backup
ASUS Zip
Ur Time
Business Card Recognition
Auto Cleaner
Meeting Time Planner
Remote Presenter
Voice Commander
GPS Catcher
Call filter
ASUS Status
ClearVue PDF Viewer
Network Auto Configuration
Youtube / Flickr Uploader

MOTOROLA TECHNOLOGIES


Motorola Inc. (NYSE: MOT) is an American, multinational, Fortune 100,[8] telecommunications company based in Schaumburg, Illinois. It is a manufacturer of wireless telephone handsets, also designing and selling wireless network infrastructure equipment such as cellular transmission base stations and signal amplifiers. Motorola's home and broadcast network products include set-top boxes, digital video recorders, and network equipment used to enable video broadcasting, computer telephony, and high-definition television. Its business and government customers consist mainly of wireless voice and broadband systems used to build private networks and public safety communications systems.
Motorola started as Galvin Manufacturing Corporation in 1928. The name Motorola was adopted in 1930, and the word has been used as a trademark since the 1930s. Founders Paul Galvin and Joseph Galvin came up with the name Motorola when the company started manufacturing car radios.[9]
Many of Motorola's products have been radio-related, starting with a battery eliminator for radios, through the first walkie-talkie in the world, defense electronics, cellular infrastructure equipment, and mobile phone manufacturing. In September 1983, the firm made history when the FCC approved the DynaTAC 8000X telephone, the world's first-only commercial cellular device. The company was also strong in semiconductor technology, including integrated circuits used in computers. Motorola has been the main supplier for the microprocessors used in Atari ST, Commodore Amiga, Color Computer, and Apple Macintosh personal computers. The PowerPC family was developed with IBM and in a partnership with Apple (known as the AIM alliance). Motorola also has a diverse line of communication products, including satellite systems, digital cable boxes and modems.

QUALCOMM TECHNOLOGIES




Qualcomm was founded in 1985 by UC San Diego Professor Irwin Jacobs (the company's current chairman), Franklin Antonio, Adelia Coffman, Andrew Cohen, AJ Read, Klein Gilhousern, Andrew Viterbi and Harvey White. Jacobs and Viterbi had previously founded Linkabit. Qualcomm's first products and services included the OmniTRACS satellite locating and messaging service, used by long-haul trucking companies, developed by Parviz Nazarian and Neil Kadisha, and specialized integrated circuits for digital radio communications such as a Viterbi decoder.
Qualcomm is the inventor of CDMAone (IS-95), CDMA 2000, and CDMA 1xEV-DO, which are wireless cellular standards used for communications. The company also owns significant number of key patents on the widely adopted 3G technology, W-CDMA. The license streams from the patents on these inventions, and related products are a major component of Qualcomm's business.
The current UMTS air interfaces are for the most part based on Qualcomm patents, and royalties from these patents represent a significant part of Qualcomm's revenue. Qualcomm's control over 3G technology and the revenue connected to licensing is a driving force behind many developments within the mobile sector.
This followed a series of patent-related lawsuits and antitrust complaints, spearheaded by Broadcom, in the US. In 2006, Broadcom started a series of patent-related lawsuits and antitrust complaints against Qualcomm to get what Broadcom regarded fair terms for access to the W-CDMA technologies. Broadcom was soon joined by Nokia and others, and complaint were also filed in the EC.[2]
The Chinese TDSCDMA 3G technology was developed primary to avoid Qualcomm licensing fees, although Qualcomm claims that the Chinese technology still infringes on many Qualcomm patents.

INTEL TECHNOLOGIES




Intel Corporation (NASDAQ: INTC; SEHK: 4335) is the world's largest semiconductor company and the inventor of the x86 series of microprocessors, the processors found in most personal computers. Founded on July 18, 1968 as Integrated Electronics Corporation and based in Santa Clara, California, USA, Intel also makes motherboard chipsets, network cards and ICs, flash memory, graphic chips, embedded processors, and other devices related to communications and computing. Founded by semiconductor pioneers Robert Noyce and Gordon Moore, and widely associated with the executive leadership and vision of Andrew Grove, Intel combines advanced chip design capability with a leading-edge manufacturing capability. Originally known primarily to engineers and technologists, Intel's successful "Intel Inside" advertising campaign of the 1990s made it and its Pentium processor household names.
Intel was an early developer of SRAM and DRAM memory chips, and this represented the majority of its business until the early 1980s. While Intel created the first commercial microprocessor chip in 1971, it was not until the success of the personal computer (PC) that this became their primary business. During the 1990s, Intel invested heavily in new microprocessor designs and in fostering the rapid growth of the PC industry. During this period Intel became the dominant supplier of microprocessors for PCs, and was known for aggressive and sometimes controversial tactics in defense of its market position, as well as a struggle with Microsoft for control over the direction of the PC industry.[5][6] The 2007 rankings of the world's 100 most powerful brands published by Millward Brown Optimor showed the company's brand value falling 10 places – from number 15 to number 25.

IBM TECHNOLOGIES




International Business Machines Corporation, abbreviated IBM and nicknamed "Big Blue", is a multinational computer technology and consulting corporation headquartered in Armonk, New York, United States. The company is one of the few information technology companies with a continuous history dating back to the 19th century. IBM manufactures and sells computer hardware and software, and offers infrastructure services, hosting services, and consulting services in areas ranging from mainframe computers to nanotechnology.[3]
IBM has been known through most of its recent history as the world's largest computer company; with over 388,000 employees worldwide, IBM is the largest information technology employer in the world. Despite falling behind Hewlett-Packard in total revenue since 2006, it remains the most profitable. IBM holds more patents than any other U.S. based technology company.[4] It has engineers and consultants in over 170 countries and IBM Research has eight laboratories worldwide.[5] IBM employees have earned three Nobel Prizes, four Turing Awards, five National Medals of Technology, and five National Medals of Science.[6] As a chip maker, IBM has been among the Worldwide Top 20 Semiconductor Sales Leaders in past years, and in 2007 IBM ranked second in the list of largest software companies in the world.

BLU- RAY


Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage media format. Its main uses are high-definition video and data storage. The disc has the same physical dimensions as a standard DVD or CD.
The name Blu-ray Disc is derived from the blue laser (violet colored) used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A dual layer Blu-ray Disc can store 50 GB, almost six times the capacity of a double-dual layer DVD (or more than 10 times if single-layer).
During the high definition optical disc format war, Blu-ray Disc competed with the HD DVD format. On February 19, 2008, Toshiba — the main company supporting HD DVD — announced it would no longer develop, manufacture, and market HD DVD players and recorders,[2] leading almost all other HD DVD companies to follow suit, effectively ending the format war.
Blu-ray Disc was developed by the Blu-ray Disc Association, a group representing consumer electronics, computer hardware, and motion picture production. As of September 20, 2008 more than 850 Blu-ray Disc titles have been released in the United States and more than 500 Blu-ray Disc titles have been released in Japan.[3][4] There are expected to be over 1500 Blu-ray Disc titles released in the United States by the end of 2008.[5
]

PC BOARDS


The motherboard is the main circuit board inside the PC. It holds the CPU and memory, provides expansion slots for peripherals, and, whether directly or indirectly, connects to every part of the PC.
The essential motherboard make-up includes the chipset (known as the "glue logic"), some code in ROM and the various wired interconnections between the components know as buses. The chipset is fundamental, and controls how the motherboard interacts with everything else in the system. A good chipset can be more important than the power of CPU or the amount of RAM. The ROM code includes the BIOS, which has user-changeable options for how the motherboard operates with integral and connected devices. The buses are the electrical wires that connect everything together.
Motherboard designs use many different buses to link their various components. For instance, wide, high-speed buses are difficult and expensive to produce. The signals travel at such a rate that even distances of just a few centimetres cause timing problems, while the metal tracks on the circuit board act as miniature radio antennae, transmitting electromagnetic noise that introduces interference with signals elsewhere in the system. For these reasons, design engineers try to keep the fastest buses confined to the smallest area of the motherboard and use slower, more robust buses for other parts.
In this section, the following pages focus on basic motherboard functionality and layout. You can find more information elsewhere on the site, including

DELL COMPUTERS


Dell, Inc. is a multinational company based in Round Rock, Texas which develops, manufactures, sells, and supports personal computers and other computer-related products. As of 2008, Dell employs more than 88,000 people worldwide.[3]
Dell grew during the 1980s and 1990s to become (for a time) the largest seller of PCs and servers. As of 2008, it held the second spot in computer-sales within the industry behind the Hewlett-Packard Company. The company currently sells personal computers, servers, data storage devices, network switches, software, computer peripherals and televisions.
In 2006, Fortune magazine ranked Dell as the 25th-largest company in the Fortune 500 list, 8th on its annual Top 20 list of the most-admired companies in the United States. In 2007 Dell ranked 34th and 8th respectively on the equivalent lists for the year. A 2006 publication identified Dell as one of 38 high-performance companies in the S&P 500 which had consistently out-performed the market over

POCKET PC'S

A Pocket PC, abbreviated P/PC or PPC, is a hardware specification for a handheld-sized computer (Personal digital assistant) that runs the Microsoft Windows Mobile operating system. It may have the capability to run an alternative operating system like NetBSD, Linux, Android or others. It has many of the capabilities of modern desktop PCs.
Currently there are thousands of applications for handhelds adhering to the Microsoft Pocket PC specification, many of which are freeware. Some of these devices also include mobile phone features. Microsoft compliant Pocket PCs can also be used with many other add-ons like GPS receivers, barcode readers, RFID readers, and cameras.
In 2007, with the advent of Windows Mobile 6, Microsoft dropped the name Pocket PC in favor of a new naming scheme. Devices without an integrated phone are called Windows Mobile Classic instead of Pocket PC. Devices with an integrated phone and a touch screen are called Windows Mobile
OS versions
Main article: Windows Mobile
Windows Mobile 6.1
Microsoft's current release is Windows Mobile 6.1, one of the major changes from WM6 is the introduction of Instant messaging-like texting. Press release on April 1st 2008.

Windows Mobile 6
Microsoft's Windows Mobile 6, internally code-named "Crossbow'". It was officially released by Microsoft on February 12, 2007.

Windows Mobile 5
Windows Mobile 5.0 marked the convergence of the Phone Edition and Professional Edition operating systems into one system that contains both phone and PDA capabilities. A 'Phone' application was included in the OS, and all PIM applications were updated to interface with it. Windows Mobile 5.0 was compatible with Microsoft's Smartphone operating system and was capable of running Smartphone applications.
Pocket PCs running previous versions of the operating system generally stored user-installed applications and data in RAM, which meant that if the battery was depleted the device would lose all of its data. Windows Mobile 5.0 solved this problem by storing all user data in persistent (flash) memory, leaving the RAM to be used only for running applications, as it would be on a desktop computer. As a result, Windows Mobile 5.0 Pocket PCs generally had a greater amount of flash memory, and a smaller amount of RAM, compared to earlier devices

Windows Mobile 2003
Windows Mobile 2003 consisted of the Windows CE.NET 4.2 operating system bundled with scaled-down versions of many popular desktop applications, including Microsoft Outlook, Internet Explorer, Word, Excel, Windows Media Player, and others.
Windows Mobile 2003 Second Edition added native landscape support as well as other fixes and changes to those features already present in the original release of Windows Mobile 2003.

Pocket PC 2000 and 2002
Pocket PC 2002 (launched October 2001) and Pocket PC 2000 (launched April 2000) both ran Windows CE 3.0 underneath.

BIPOLAR JUBCTION TRANSISTER

BJT redirects here. For the Japanese language proficiency test, see Business Japanese Proficiency Test.
A bipolar junction transistor (BJT) is a type of transistor. It is a three-terminal device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes.
An NPN transistor can be considered as two diodes with a shared anode region. In typical operation, the emitter–base junction is forward biased and the base–collector junction is reverse biased. In an NPN transistor, for example, when a positive voltage is applied to the base–emitter junction, the equilibrium between thermally generated carriers and the repelling electric field of the depletion region becomes unbalanced, allowing thermally excited electrons to inject into the base region. These electrons wander (or "diffuse") through the base from the region of high concentration near the emitter towards the region of low concentration near the collector. The electrons in the base are called minority carriers because the base is doped p-type which would make holes the majority carrier in the base.
The base region of the transistor must be made thin, so that carriers can diffuse across it in much less time than the semiconductor's minority carrier lifetime, to minimize the percentage of carriers that recombine before reaching the collector–base junction. To ensure this, the thickness of the base is much less than the diffusion length of the electrons. The collector–base junction is reverse-biased, so little electron injection occurs from the collector to the base, but electrons that diffuse through the base towards the collector are swept into the collector by the electric field in the depletion region of the collector–base juncti
Voltage, current, and charge control
The collector–emitter current can be viewed as being controlled by the base–emitter current (current control), or by the base–emitter voltage (voltage control). These views are related by the current–voltage relation of the base–emitter junction, which is just the usual exponential current–voltage curve of a p-n junction (diode).[1]
The physical explanation for collector current is the amount of minority-carrier charge in the base region.[1][2][3] Detailed models of transistor action, such as the Gummel–Poon model, account for the distribution of this charge explicitly to explain transistor behavior more exactly. The charge-control view easily handles photo-transistors, where minority carriers in the base region are created by the absorption of photons, and handles the dynamics of turn-off, or recovery time, which depends on charge in the base region recombining. However, since base charge is not a signal that is visible at the terminals, the current- and voltage-control views are usually used in circuit design and analysis.
In analog circuit design, the current-control view is sometimes used since it is approximately linear. That is, the collector current is approximately βF times the base current. Some basic circuits can be designed by assuming that the emitter–base voltage is approximately constant, and that collector current is beta times the base current. However, to accurately and reliably design production bjt circuits, the voltage-control (for example, Ebers–Moll) model is required[1] The voltage-control model requires an exponential function to be taken into account, but when it is linearized such that the transistor can be modelled as a transconductance, as in the Ebers–Moll model, design for circuits such as differential amplifiers again becomes a mostly linear problem, so the voltage-control view is often preferred. For translinear circuits, in which the exponential I–V curve is key to the operation, the transistors are usually modelled as voltage controlled with transconductance proportional to collector current. In general, transistor level circuit design is performed using SPICE or a comparable analogue circuit simulator, so model complexity is usually not of much concern to the designer.

Transistor 'alpha' and 'beta'
The proportion of electrons able to cross the base and reach the collector is a measure of the BJT efficiency. The heavy doping of the emitter region and light doping of the base region cause many more electrons to be injected from the emitter into the base than holes to be injected from the base into the emitter. The common-emitter current gain is represented by βF or hfe. It is approximately the ratio of the DC collector current to the DC base current in forward-active region, and is typically greater than 100. Another important parameter is the common-base current gain, αF. The common-base current gain is approximately the gain of current from emitter to collector in the forward-active region. This ratio usually has a value close to unity; between 0.98 and 0.998. Alpha and beta are more precisely related by the following identities (NPN transistor):

Structure

Simplified cross section of a planar NPN bipolar junction transistor

Die of a KSY34 high-frequency NPN transistor, base and emitter connected via bonded wires
A BJT consists of three differently doped semiconductor regions, the emitter region, the base region and the collector region. These regions are, respectively, p type, n type and p type in a PNP, and n type, p type and n type in a NPN transistor. Each semiconductor region is connected to a terminal, appropriately labeled: emitter (E), base (B) and collector (C).
The base is physically located between the emitter and the collector and is made from lightly doped, high resistivity material. The collector surrounds the emitter region, making it almost impossible for the electrons injected into the base region to escape being collected, thus making the resulting value of α very close to unity, and so, giving the transistor a large β. A cross section view of a BJT indicates that the collector–base junction has a much larger area than the emitter–base junction.
The bipolar junction transistor, unlike other transistors, is usually not a symmetrical device. This means that interchanging the collector and the emitter makes the transistor leave the forward active mode and start to operate in reverse mode. Because the transistor's internal structure is usually optimized to forward-mode operation, interchanging the collector and the emitter makes the values of α and β in reverse operation much smaller than those found in forward operation; often the α of the reverse mode is lower than 0.5. The lack of symmetry is primarily due to the doping ratios of the emitter and the collector. The emitter is heavily doped, while the collector is lightly doped, allowing a large reverse bias voltage to be applied before the collector–base junction breaks down. The collector–base junction is reverse biased in normal operation. The reason the emitter is heavily doped is to increase the emitter injection efficiency: the ratio of carriers injected by the emitter to those injected by the base. For high current gain, most of the carriers injected into the emitter–base junction must come from the emitter.
The low-performance "lateral" bipolar transistors sometimes used in CMOS processes are sometimes designed symmetrically, that is, with no difference between forward and backward operation.
Small changes in the voltage applied across the base–emitter terminals causes the current that flows between the emitter and the collector to change significantly. This effect can be used to amplify the input voltage or current. BJTs can be thought of as voltage-controlled current sources, but are more simply characterized as current-controlled current sources, or current amplifiers, due to the low impedance at the base.
Early transistors were made from germanium but most modern BJTs are made from silicon. A significant minority are also now made from gallium arsenide, especially for very high speed applications (see HBT, below).

NPN

The symbol of an NPN Bipolar Junction Transistor.
NPN is one of the two types of bipolar transistors, in which the letters "N" and "P" refer to the majority charge carriers inside the different regions of the transistor. Most bipolar transistors used today are NPN, because electron mobility is higher than hole mobility in semiconductors, allowing greater currents and faster operation.
NPN transistors consist of a layer of P-doped semiconductor (the "base") between two N-doped layers. A small current entering the base in common-emitter mode is amplified in the collector output. In other terms, an NPN transistor is "on" when its base is pulled high relative to the emitter.
The arrow in the NPN transistor symbol is on the emitter leg and points in the direction of the conventional current flow when the device is in forward active mode.
One mnemonic device for identifying the symbol for the NPN transistor is "not pointing in".[5]

PNP
The other type of BJT is the PNP with the letters "P" and "N" referring to the majority charge carriers inside the different regions of the transistor.

The symbol of a PNP Bipolar Junction Transistor.
PNP transistors consist of a layer of N-doped semiconductor between two layers of P-doped material. A small current leaving the base in common-emitter mode is amplified in the collector output. In other terms, a PNP transistor is "on" when its base is pulled low relative to the emitter.
The arrow in the PNP transistor symbol is on the emitter leg and points in the direction of the conventional current flow when the device is in forward active mode.
One mnemonic device for identifying the symbol for the PNP transistor is "points in proudly".[5]
Heterojunction bipolar transistor

Bands in graded heterojunction npn bipolar transistor. Barriers indicated for electrons to move from emitter to base, and for holes to be injected backward from base to emitter; Also, grading of bandgap in base assists electron transport in base region; Light colors indicate depleted regions
The heterojunction bipolar transistor (HBT) is an improvement of the BJT that can handle signals of very high frequencies up to several hundred GHz. It is common nowadays in ultrafast circuits, mostly RF systems.[6][7] Heterojunction transistors have different semiconductors for the elements of the transistor. Usually the emitter is composed of a larger bandgap material than the base. The figure shows that this difference in bandgap allows the barrier for holes to inject backward into the base, denoted in figure as Δφp, to be made large, while the barrier for electrons to inject into the base Δφn is made low. This barrier arrangement helps reduce minority carrier injection from the base when the emitter-base junction is under forward bias, and thus reduces base current and increases emitter injection efficiency.
The improved injection of carriers into the base allows the base to have a higher doping level, resulting in lower resistance to access the base electrode. In the more traditional BJT, also referred to as homojunction BJT, the efficiency of carrier injection from the emitter to the base is primarily determined by the doping ratio between the emitter and base, which means the base must be lightly doped to obtain high injection efficiency, making its resistance relatively high. In addition, higher doping in the base can improve figures of merit like the Early voltage by lessening base narrowing.
The grading of composition in the base, for example, by progressively increasing the amount of germanium in a SiGe transistor, causes a gradient in bandgap in the neutral base, denoted in the figure by ΔφG, providing a "built-in" field that assists electron transport across the base. That drift component of transport aids the normal diffusive transport, increasing the frequency response of the transistor by shortening the transit time across the base.
Two commonly used HBTs are silicon–germanium and aluminum gallium arsenide, though a wide variety of semiconductors may be used for the HBT structure. HBT structures are usually grown by epitaxy techniques like MOCVD and MBE.

RANDOM ACCESS MEMORY

Random access memory (usually known by its acronym, RAM) is a type of computer data storage. Today it takes the form of integrated circuits that allow the stored data to be accessed in any order, i.e. at random. The word random thus refers to the fact that any piece of data can be returned in a constant time, regardless of its physical location and whether or not it is related to the previous piece of data.[1]
This contrasts with storage mechanisms such as tapes, magnetic discs and optical discs, which rely on the physical movement of the recording medium or a reading head. In these devices, the movement takes longer than the data transfer, and the retrieval time varies depending on the physical location of the next item.
Types of RAM
Modern types of writable RAM generally store a bit of data in either the state of a flip-flop, as in SRAM (static RAM), or as a charge in a capacitor (or transistor gate), as in DRAM (dynamic RAM), EPROM, EEPROM and Flash. Some types have circuitry to detect and/or correct random faults called memory errors in the stored data, using parity bits or error correction codes. RAM of the read-only type, ROM, instead uses a metal mask to permanently enable/disable selected transistors, instead of storing a charge in them.
As both SRAM and DRAM are volatile, other forms of computer storage, such as disks and magnetic tapes, have been used as "permanent" storage in traditional computers. Many newer products instead rely on flash memory to maintain data between sessions of use: examples include PDAs, small music players, mobile phones, synthesizers, advanced calculators, industrial instrumentaion and robotics, and many other types of products; even certain categories of personal computers, such as the OLPC XO-1, Asus Eee PC, and others, have begun replacing magnetic disk with so called flash drives (similar to fast memory cards equipped with an IDE or SATA interface).
There are two basic types of flash memory: the NOR type, which is capable of true random access, and the NAND type, which is not; the former is therefore often used in place of ROM, while the latter is used in most memory cards and solid-state drives, due to a lower price.

Memory hierarchy

One module of 128MB NEC SD-RAM.
Many computer systems have a memory hierarchy consisting of CPU registers, on-die SRAM caches, external caches, DRAM, paging systems, and virtual memory or swap space on a hard drive. This entire pool of memory may be referred to as "RAM" by many developers, even though the various subsystems can have very different access times, violating the original concept behind the random access term in RAM. Even within a hierarchy level such as DRAM, the specific row, column, bank, rank, channel, or interleave organization of the components make the access time variable, although not to the extent that rotating storage media or a tape is variable. (Generally, the memory hierarchy follows the access time with the fast CPU registers at the top and the slow hard drive at the bottom.)
In most modern personal computers, the RAM comes in easily upgraded form of modules called memory modules or DRAM modules about the size of a few sticks of chewing gum. These can quickly be replaced should they become damaged or too small for current purposes. As suggested above, smaller amounts of RAM (mostly SRAM) are also integrated in the CPU and other ICs on the motherboard, as well as in hard-drives, CD-ROMs, and several other parts of the computer system.

Swapping
If a computer becomes low on RAM during intensive application cycles, the computer can resort to swapping. In this case, the computer temporarily uses hard drive space as additional memory. Constantly relying on this type of backup memory is called thrashing, which is generally undesirable because it lowers overall system performance. In order to reduce the dependency on swapping, more RAM can be installed.

Other uses of the term
Other physical devices with read/write capability can have "RAM" in their names: for example, DVD-RAM. "Random access" is also the name of an indexing method: hence, disk storage is often called "random access" because the reading head can move relatively quickly from one piece of data to another, and does not have to read all the data in between. However the final "M" is crucial: "RAM" (provided there is no additional term as in "DVD-RAM") always refers to a solid-state device.

"RAM disks"
Software can "partition" a portion of a computer's RAM, allowing it to act as a much faster hard drive that is called a RAM disk. Unless the memory used is non-volatile, a RAM disk loses the stored data when the computer is shut down. However, volatile memory can retain its data when the computer is shut down if it has a separate power source, usually a battery.

Recent developments
Several new types of non-volatile RAM, which will preserve data while powered down, are under development. The technologies used include carbon nanotubes and the magnetic tunnel effect. In summer 2003, a 128 KB magnetic RAM chip manufactured with 0.18 µm technology was introduced. The core technology of MRAM is based on the magnetic tunnel effect. In June 2004, Infineon Technologies unveiled a 16 MB prototype again based on 0.18 µm technology. Nantero built a functioning carbon nanotube memory prototype 10 GB array in 2004. Whether some of these technologies will be able to eventually take a significant market share from either DRAM, SRAM, or flash-memory technology, remains to be seen however.
In 2006, "Solid-state drives" (based on flash memory) with capacities exceeding 150 gigabytes and speeds far exceeding traditional disks have become available. This development has started to blur the definition between traditional random access memory and "disks", dramatically reducing the difference in performance.

Memory wall
The "memory wall" is the growing disparity of speed between CPU and memory outside the CPU chip. An important reason for this disparity is the limited communication bandwidth beyond chip boundaries. From 1986 to 2000, CPU speed improved at an annual rate of 55% while memory speed only improved at 10%. Given these trends, it was expected that memory latency would become an overwhelming bottleneck in computer performance. [2]
Currently, CPU speed improvements have slowed significantly partly due to major physical barriers and partly because current CPU designs have already hit the memory wall in some sense. Intel summarized these causes in their Platform 2015 documentation (PDF):
“First of all, as chip geometries shrink and clock frequencies rise, the transistor leakage current increases, leading to excess power consumption and heat (more on power consumption below). Secondly, the advantages of higher clock speeds are in part negated by memory latency, since memory access times have not been able to keep pace with increasing clock frequencies. Third, for certain applications, traditional serial architectures are becoming less efficient as processors get faster (due to the so-called Von Neumann bottleneck), further undercutting any gains that frequency increases might otherwise buy. In addition, partly due to limitations in the means of producing inductance within solid state devices, resistance-capacitance (RC) delays in signal transmission are growing as feature sizes shrink, imposing an additional bottleneck that frequency increases don't address.”
The RC delays in signal transmission were also noted in Clock Rate versus IPC: The End of the Road for Conventional Microarchitectures which projects a maximum of 12.5% average annual CPU performance improvement between 2000 and 2014. The data on Intel Processors clearly shows a slowdown in performance improvements in recent processors. However, Intel's new processors, Core 2 Duo (codenamed Conroe) show a significant improvement over previous Pentium 4 processors; due to a more efficient architecture, performance increased while clock rate actually decreased.

MOTHERBOARD

A motherboard is the central or primary printed circuit board (PCB) making up a complex electronic system, such as a modern computer. It is also known as a mainboard, baseboard, system board, planar board, or, on Apple computers, a logic board, and is sometimes abbreviated casually as mobo.[1]
Most motherboards produced today are designed for so-called IBM-compatible computers, which held over 96% of the global personal computer market in 2005.[2] Motherboards for IBM-compatible computers are specifically covered in the PC motherboard article.
A motherboard, like a backplane, provides the electrical connections by which the other components of the system communicate, but unlike a backplane also contains the central processing unit and other subsystems such as real time clock, and some peripheral interfaces Components and functions

The 2004 K7VT4A Pro[3] motherboard by ASRock. The chipset on this board consists of northbridge and southbridge chips.
The motherboard of a typical desktop consists of a large printed circuit board. It holds electronic components and interconnects, as well as physical connectors (sockets, slots, and headers) into which other computer components may be inserted or attached.
Most motherboards include, at a minimum:
sockets (or slots) in which one or more microprocessors (CPUs) are installed[4]
slots into which the system's main memory is installed (typically in the form of DIMM modules containing DRAM chips)
a chipset which forms an interface between the CPU's front-side bus, main memory, and peripheral buses
non-volatile memory chips (usually Flash ROM in modern motherboards) containing the system's firmware or BIOS
a clock generator which produces the system clock signal to synchronize the various components
slots for expansion cards (these interface to the system via the buses supported by the chipset)
power connectors and circuits, which receive electrical power from the computer power supply and distribute it to the CPU, chipset, main memory, and expansion cards.[5]

The Octek Jaguar V motherboard from 1993.[6] This board has 6 ISA slots but few onboard peripherals, as evidenced by the lack of external connectors.
Additionally, nearly all motherboards include logic and connectors to support commonly-used input devices, such as PS/2 connectors for a mouse and keyboard. Early personal computers such as the Apple II or IBM PC included only this minimal peripheral support on the motherboard. Occasionally video interface hardware was also integrated into the motherboard; for example on the Apple II, and rarely on IBM-comatible computers such as the IBM PC Jr. Additional peripherals such as disk controllers and serial ports were provided as expansion cards.
Given the high thermal design power of high-speed computer CPUs and components, modern motherboards nearly always include heatsinks and mounting points for fans to dissipate excess heat.

Integrated peripherals

Diagram of a modern motherboard, which supports many on-board peripheral functions as well as several expansion slots.
With the steadily declining costs and size of integrated circuits, it is now possible to include support for many peripherals on the motherboard. By combining many functions on one PCB, the physical size and total cost of the system may be reduced; highly-integrated motherboards are thus especially popular in small form factor and budget computers.
For example, the ECS RS485M-M,[7] a typical modern budget motherboard for computers based on AMD processors, has on-board support for a very large range of peripherals:
disk controllers for a floppy disk drive, up to 2 PATA drives, and up to 6 SATA drives (including RAID 0/1 support)
integrated ATI Radeon graphics controller supporting 2D and 3D graphics, with VGA and TV output
integrated sound card supporting 8-channel (7.1) audio and S/PDIF output
fast Ethernet network controller for 10/100 Mbit networking
USB 2.0 controller supporting up to 12 USB ports
IrDA controller for infrared data communication (e.g. with an IrDA enabled Cellular Phone or Printer)
temperature, voltage, and fan-speed sensors that allow software to monitor the health of computer components
Expansion cards to support all of these functions would have cost hundreds of dollars even a decade ago, however as of April 2007 such highly-integrated motherboards are available for as little as $30 in the USA.
Temperature and reliability
Motherboards are generally air cooled with heat sinks often mounted on larger chips, such as the northbridge, in modern motherboards. Passive cooling, or a single fan mounted on the power supply, was sufficient for many desktop computer CPUs until the late 1990s; since then, most have required CPU fans mounted on their heatsinks, due to rising clock speeds and power consumption. Most motherboards have connectors for additional case fans as well. Newer motherboards have integrated temperature sensors to detect motherboard and CPU temperatures, and controllable fan connectors which the BIOS or operating system can use to regulate fan speed.
Some small form factor computers and home theater PCs designed for quiet and energy-efficient operation boast fan-less designs. This typically requires the use of a low-power CPU, as well as careful layout of the motherboard and other components to allow for heat sink placement.
A 2003 study[8] found that some spurious computer crashes and general reliability issues, ranging from screen image distortions to I/O read/write errors, can be attributed not to software or peripheral hardware but to aging capacitors on PC motherboards. Ultimately this was shown to be the result of a faulty electrolyte formulation.[9]
For more information on premature capacitor failure on PC motherboards, see capacitor plague.
Motherboards use electrolytic capacitors to filter the DC power distributed around the board. These capacitors age at a temperature-dependent rate, as their water based electrolytes slowly evaporate. This can lead to loss of capacitance and subsequent motherboard malfunctions due to voltage instabilities. While most capacitors are rated for 2000 hours of operation at 105 °C,[10] their expected design life roughly doubles for every 10 °C below this. At 45 °C a lifetime of 15 years can be expected. This appears reasonable for a computer motherboard, however many manufacturers have delivered substandard capacitors, which significantly reduce this life expectancy. Inadequate case cooling and elevated temperatures easily exacerbate this problem. It is possible, but tedious and time-consuming, to find and replace failed capacitors on PC motherboards; it is less expensive to buy a new motherboard than to pay
for such a repair.

iPHONES

The iPhone is an Internet-enabled multimedia mobile phone designed and marketed by Apple Inc. It has a multi-touch screen with virtual keyboard and buttons, but a minimal amount of hardware input. The iPhone's functions include those of a camera phone and portable media player (equivalent to the iPod) in addition to text messaging and visual voicemail. It also offers Internet services including e-mail, web browsing, and local Wi-Fi connectivity. The first generation phone hardware was quad-band GSM with EDGE; the second generation uses UMTS and HSDPA.[29]
Screen and interface
The 9 cm (3.5 in) liquid crystal display (320×480 px at 6.3 px/mm, 160 ppi) HVGA touchscreen with scratch-resistant glass[33] is specifically created for use with a finger, or multiple fingers for multi-touch sensing. Because the screen is a capacitive touchscreen, bare skin is required; a stylus or a normal glove prevents the necessary electrical conductivity.[34][35][36][37]
Almost all input is given through the touch screen, which understands complex gestures using multi-touch. The iPhone user interface enables the user to move the content itself up or down by a touch-drag motion of the finger. For example, zooming in and out of web pages and photos is done by placing two fingers on the screen and spreading them farther apart or closer together. Similarly, scrolling through a long list in a menu works as if the list is pasted on the outer surface of a wheel: the wheel can be "spun" by sliding a finger over the display from bottom to top (or vice versa). In either case, the list continues to move based on the flicking motion of the finger, slowly decelerating as if affected by friction. In this way, the interface simulates the physics of a real 3D object. There are other visual effects, such as horizontally sliding sub-selections and co-selections from right and left, vertically sliding system menus from the bottom (e.g. favorites, keyboard), and menus and widgets that turn around to allow settings to be configured on their back sides.
The display responds to three sensors. A proximity sensor shuts off the display and touchscreen when the iPhone is brought near the face to save battery power and to prevent inadvertent inputs from the user's face and ears. An ambient light sensor adjusts the display brightness which in turn saves battery power. A 3-axis accelerometer senses the orientation of the phone and changes the screen accordingly.[38] Photo browsing, web browsing, and music playing support both upright and left or right widescreen orientations, while videos play in only one widescreen orientation.[citation needed]
A software update allowed the first generation iPhone to use cell towers and Wi-Fi networks to locate itself despite lacking a hardware GPS. The iPhone 3G includes A-GPS but also uses cell towers and Wi-Fi for location finding.
A single "home" hardware button below the display brings up the main menu. Subselections are made via the touchscreen. The iPhone utilizes a full-paged display, with context-specific submenus at the top and/or bottom of each page, sometimes depending on screen orientation. Detail pages display the equivalent of a "Back" button to return to the parent menu.
The iPhone has three physical switches on its sides: wake/sleep, volume up/down, and ringer on/off. These are made of plastic on the original iPhone and metal on the iPhone 3G. All other multimedia and phone operations are done via the touchscreen.

Audio
The iPhone's headphones are similar to those of most current smartphones, incorporating a microphone. A multipurpose button in the microphone can be used to play or pause music, skip tracks, and answer or end phone calls without touching the iPhone. The 3.5 mm TRS connector for the headphones is located on the top left corner. The headphone socket on the original iPhone is recessed into the casing and is narrow when compared to some headphone jacks, making it incompatible with most headphones without the use of an adapter.[39] The iPhone 3G has a flush mounted headphone socket.
Wireless earpieces that use Bluetooth technology to communicate with the iPhone are sold separately. It does not support stereo audio.
The loudspeaker is used both for handsfree operations and media playback, but does not support voice recording.
Composite or component video at up to 576i and stereo audio can be output from the dock connector using an adapter sold by Apple.[40]

Battery
The iPhone features a built-in rechargeable battery that is not user-replaceable, similar to existing iPods, but dissimilar to most existing cellular phones.[41][42] If the battery prematurely reaches the end of its life time, the phone can be returned to Apple and replaced for free while still in warranty,[43] one year at purchase and extended to two years with AppleCare. The cost of having Apple provide a new battery and replace it when the iPhone is out of warranty is, in the United States, US$79 and US$6.95 for shipping.[44]
Since July 2007 third party battery packs have been available[45] at a much lower price than Apple's own battery replacement program. These kits often include a small screwdriver and an instruction leaflet, but as with many newer iPod models the battery in the original iPhone has been soldered in. Therefore a soldering iron is required to install the new battery. This is not the case with the iPhone 3G as it uses a different battery fitted with a connector[46]
The original iPhone's battery was stated to be capable of providing up to seven hours of video, six hours of web browsing, eight hours of talk time, 24 hours of music or up to 250 hours on standby.[33] Apple's site says that the battery life "is designed to retain up to 80% of its original capacity after 400 full charge and discharge cycles",[47] which is comparable to the iPod batteries.
The iPhone 3G's battery is stated to be capable of providing up to seven hours of video, six hours of web browsing on Wi-Fi or five on 3G, ten hours of 2G talk time, or five on 3G, 24 hours of music, or 300 hours of standby.[27]
The Foundation for Taxpayer and Consumer Rights, a consumer advocate group, has sent a complaint to Apple and AT&T over the fee that consumers have to pay to have the battery replaced.[48] Though the battery replacement service and its pricing was not made known to buyers until the day the product was launched,[48][49] a similar service had been well established for the iPods by Apple and various third party service providers.

SIM card

The original iPhone's SIM card slot shown as open, with ejected SIM card.
The SIM card is located in a slot at the top of the device, which can be ejected with a paperclip or a SIM card ejection tool which is included with the iPhone 3G.[50] The iPhone is usually sold with a simlock preventing the use of SIM cards from different mobile networks.

Storage
The iPhone was initially released with two options for internal storage size; either a 4 GB or 8 GB flash drive (manufactured by Samsung) model was available. On September 5, 2007, Apple announced they were discontinuing the 4 GB models.[51] On February 5, 2008, Apple announced the addition of a 16 GB model to the iPhone lineup.[52] The iPhone does not contain any memory card slots for expanded storage.

Included items and accessories
Both the iPhone and the iPhone 3G came with a series of included accessories and items when purchased.

Items common to both versions
Appropriate documentation
Stereo headset with microphone
Dock connector to USB cable (standard USB cable for connection)
Cleaning/polishing cloth

Original iPhone
Dock
Standard USB power adapter

iPhone 3G
SIM ejector tool
"Mini" USB power adapter (U.S. model)
Standard USB power adapter (European model)

Software
Main article: iPhone OS
iPhone OS is the operating system that runs on the iPhone and iPod touch. It is based on a variant of the same basic Mach kernel that is found in Mac OS X. iPhone OS includes the software component "Core Animation" from Mac OS X v10.5 which, together with the PowerVR MBX 3D hardware, is responsible for the smooth animations used in its user interface. The operating system takes up considerably less than half a GB of the device's total 8 GB or 16 GB storage.[53] It will be capable of supporting bundled and future applications from Apple.
Like an iPod, the iPhone is managed with iTunes version 7.3 or later, which is compatible with Mac OS X version 10.4.10 or later, and 32-bit Windows XP or Vista.[54] The release of iTunes 7.6 expanded this support to include 64-bit versions of XP and Vista,[55] and a workaround has been discovered for previous 64-bit Windows operating systems.[56]
The iPhone' applications can not simply be copied from Mac OS X and have to be written and compiled specifically for the iPhone. Additionally, the Safari web browser supports web applications written with AJAX, which, by design, are platform agnostic applications.

Applications
See also: iPhone SDK

The photo display application
There are several applications located on the "Home" screen: Text (SMS messaging), Calendar, Photos, Camera, YouTube, Stocks, Maps (Google Maps), Weather, Clock, Calculator, Notes, Settings, and iTunes (store). Four other applications, docked at the base of the screen, delineate the iPhone's main purposes: Phone, Mail, Safari, and iPod.[57]
The YouTube application streams videos over Wi-Fi, 2G, or 3G after encoding them using the open H.264 codec, to which YouTube has converted about 10,000 videos. As a result, the YouTube application on iPhone can currently view only a certain selection of videos from the site.[58]
At WWDC 2007 on June 11, 2007 Apple announced that the iPhone will support third-party "applications" via the Safari web browser that share the look and feel of the iPhone interface. On October 17, 2007, Steve Jobs, in an open letter posted to Apple's "Hot News" weblog, announced that a software development kit (SDK) would be made available to third-party developers in February 2008. Due to security concerns and Jobs' praise of Nokia's digital signature system, it was suggested that Apple would adopt a similar method. The SDK will also allow application development for the iPod touch.[59] The iPhone SDK was officially announced on March 6, 2008, at the Apple Town Hall facility.[60] The SDK will allow developers to develop native applications for the iPhone and iPod touch, as well as test them in an "iPhone simulator". However, loading an application onto the devices is only possible after paying a Apple membership fee. Developers are free to set any price for their applications to be distributed through the App Store, of which they will receive a 70 percent share[61]. Developers can also opt to release the application for free and will not pay any costs to release or distribute the application beyond the membership fee. The SDK is available immediately, while the launch of applications will require waiting until a firmware update on This update will be free for iPhone users and there will be a charge for iPod touch owners.
Many Safari "applications" and un-signed native applications are also available.The ability to install native applications onto the iPhone outside of the App Store will not be supported by Apple. Such native applications could be broken by any software update, but Apple has stated it will not design software updates specifically to break native applications other than applications that perform SIM unlocking.

MOBILE PHONES

The mobile phone (also called a wireless phone or cellular phone)[1] is a short-range, portable electronic device used for mobile voice or data communication over a network of specialized base stations known as cell sites. In addition to the standard voice function of a telephone, current mobile phones may support many additional services, and accessories, such as SMS for text messaging, email, packet switching for access to the Internet, gaming, bluetooth, infrared, camera with video recorder and MMS for sending and receiving photos and video. Most current mobile phones connect to a cellular network of base stations (cell sites), which is in turn interconnected to the public switched telephone network (PSTN) (the exception is satellite phones).
Cellular systems
See also: Cellular frequencies

Mobile phone tower
Mobile phones send and receive radio signals with any number of cell site base stations fitted with microwave antennas. These sites are usually mounted on a tower, pole or building, located throughout populated areas, then connected to a cabled communication network and switching system. The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, normally not more than 8 to 13 km (approximately 5 to 8 miles) away.
When the mobile phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its unique identifiers, and can then be alerted by the mobile switch when there is an incoming telephone call. The handset constantly listens for the strongest signal being received from the surrounding base stations, and is able to switch seamlessly between sites. As the user moves around the network, the "handoffs" are performed to allow the device to switch sites without interrupting the call.
Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. Many of these sites are camouflaged to blend with existing environments, particularly in scenic areas.
The dialogue between the handset and the cell site is a stream of digital data that includes digitized audio (except for the first generation analog networks). The technology that achieves this depends on the system which the mobile phone operator has adopted. The technologies are grouped by generation. The first-generation systems started in 1979 with Japan, are all analog and include AMPS and NMT. Second-generation systems, started in 1991 in Finland, are all digital and include GSM, CDMA and TDMA.
The nature of cellular technology renders many phones vulnerable to 'cloning': anytime a cell phone moves out of coverage (for example, in a road tunnel), when the signal is re-established, the phone sends out a 're-connect' signal to the nearest cell-tower, identifying itself and signalling that it is again ready to transmit. With the proper equipment, it's possible to intercept the re-connect signal and encode the data it contains into a 'blank' phone -- in all respects, the 'blank' is then an exact duplicate of the real phone and any calls made on the 'clone' will be charged to the original account.
Third-generation (3G) networks, which are still being deployed, began in Japan in 2001. They are all digital, and offer high-speed data access in addition to voice services and include W-CDMA (known also as UMTS), and CDMA2000 EV-DO. China will launch a third generation technology on the TD-SCDMA standard. Operators use a mix of predesignated frequency bands determined by the network requirements and local regulations.
In an effort to limit the potential harm from having a transmitter close to the user's body, the first fixed/mobile cellular phones that had a separate transmitter, vehicle-mounted antenna, and handset (known as car phones and bag phones) were limited to a maximum 3 watts Effective Radiated Power. Modern handheld cellphones which must have the transmission antenna held inches from the user's skull are limited to a maximum transmission power of 0.6 watts ERP. Regardless of the potential biological effects, the reduced transmission range of modern handheld phones limits their usefulness in rural locations as compared to car/bag phones, and handhelds require that cell towers be spaced much closer together to compensate for their lack of transmission power.
Some handhelds include an optional auxiliary antenna port on the back of the phone, which allows it to be connected to a large external antenna and a 3 watt cellular booster. Alternately in fringe-reception areas, a cellular repeater may be used, which uses a long distance high-gain dish antenna or yagi antenna to communicate with a cell tower far outside of normal range, and a repeater to rebroadcast on a small short-range local antenna that allows any cellphone within a few meters to function properly.

Handsets
Nokia is currently the world's largest manufacturer of mobile phones, with a global device market share of approximately 40% in 2008. Other major mobile phone manufacturers (in order of market share) include Samsung (14%), Motorola (14%), Sony Ericsson (9%) and LG (7%).[4] These manufacturers account for over 80% of all mobile phones sold and produce phones for sale in most countries.
Other manufacturers include Apple Inc., Audiovox (now UTStarcom), Benefon, BenQ-Siemens, CECT, High Tech Computer Corporation (HTC), Fujitsu, Kyocera, Mitsubishi Electric, NEC, Neonode, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech, Sonim Technologies, T&A Alcatel, Huawei, Trium and Toshiba. There are also specialist communication systems related to (but distinct from) mobile phones.
There are several categories of mobile phones, from basic phones to feature phones such as musicphones and cameraphones, to smartphones. The first smartphone was the Nokia 9000 Communicator in 1996 which incorporated PDA functionality to the basic mobile phone at the time. As miniaturization and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high-end smartphone five years ago, is a standard phone today. Several phone series have been introduced to address a given market segment, such as the RIM Blackberry focusing on enterprise/corporate customer email needs; the SonyEricsson Walkman series of musicphones and Cybershot series of cameraphones; and the Nokia N-Series of multimedia phones. The Apple iPhone is another example of a multimedia smartphone.
Main article: Mobile phone features
Mobile phones often have features beyond sending text messages and making voice calls, including Internet browsing, music (MP3) playback, memo recording, personal organizer functions, e-mail, instant messaging, built-in cameras and camcorders, ringtones, games, radio, Push-to-Talk (PTT), infrared and Bluetooth connectivity, call registers, ability to watch streaming video or download video for later viewing, video calling and serve as a wireless modem for a PC, and soon will also serve as a console of sorts to online games and other high quality games. The total value of mobile data services exceeds the value of paid services on the Internet, and was worth 31 billion dollars in 2006 (source Informa).[citation needed] The largest categories of mobile services are music, picture downloads, videogaming, adult entertainment, gambling, video/TV.

Applications
The most commonly used data application on mobile phones is SMS text messaging, with 74% of all mobile phone users as active users (over 2.4 billion out of 3.3 billion total subscribers at the end of 2007). SMS text messaging was worth over 100 billion dollars in annual revenues in 2007 and the worldwide average of messaging use is 2.6 SMS sent per day per person across the whole mobile phone subscriber base. (source Informa 2007). The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
The other non-SMS data services used by mobile phones were worth 31 Billion dollars in 2007, and were led by mobile music, downloadable logos and pictures, gaming, gambling, adult entertainment and advertising (source: Informa 2007). The first downloadable mobile content was sold to a mobile phone in Finland in 1998, when Radiolinja (now Elisa) introduced the downloadable ringing tone service. In 1999 Japanese mobile operator NTT DoCoMo introduced its mobile internet service, i-Mode, which today is the world's largest mobile internet service and roughly the same size as Google in annual revenues.
The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are expanding with many organizations providing "on-demand" news services by SMS. Some also provide "instant" news pushed out by SMS. Mobile telephony also facilitates activism and public journalism being explored by Reuters and Yahoo![5] and small independent news companies such as Jasmine News in Sri Lanka. Companies like Monster[6] are starting to offer mobile services such as job search and career advice. Consumer applications are on the rise and include everything from information guides on local activities and events to mobile coupons and discount offers one can use to save money on purchases. Even tools for creating websites for mobile phones are increasingly becoming available, e.g. Mobilemo.
Mobile payments were first trialled in Finland in 1998 when two coca cola machines in Espoo were enabled to work with SMS payments. Eventually the idea spread and in 1999 the Philippines launched the first commercial mobile payments systems, on the mobile operators Globe and Smart. Today mobile payments ranging from mobile banking to mobile credit cards to mobile commerce are very widely used in Asia and Africa, and in selected European markets. For example in the Philippines it is not unusual to have your whole paycheck paid to the mobile account. In Kenya the limit of money transfers from one mobile banking account to another is one million US dollars. In India paying utility bills with mobile gains a 5% discount. In Estonia the government found criminals collecting cash parking fees, so the government declared that only mobile payments via SMS were valid for parking and today all parking fees in Estonia are handled via mobile and the crime involved in the activity has vanished.
Mobile Applications are developed using the Six M's (previously Five M's) service-development theory created by the author Tomi Ahonen with Joe Barrett of Nokia and Paul Golding of Motorola. The Six M's are Movement (location), Moment (time), Me (personalization), Multi-user (community), Money (payments) and Machines (automation). The Six M's / Five M's theory is widely referenced in the telecoms applications literature and used by most major industry players. The first book to discuss the theory was Services for UMTS by Ahonen & Barrett in 2002.
The availability of mobile phone backup applications is growing with the increasing amount of mobile phone data being stored on mobile phones today. With mobile phone manufacturers producing mobile handsets with more and more memory storage capabilities the awareness of the importance in backing up mobile phone data is increasing. Corporate mobile phone users today keep very important company information on their mobiles, information if lost then not easily replaced. Wireless backup applications like SC BackUp offer users the chance to backup mobile phone data using advanced wireless technology. Users can backup, restore or transfer mobile data anytime, anywhere all over the world, to a secured server.