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The ATX12V 13 standard also introduced a 6-pin auxiliary connector commonly called an AUX connector to supply increased 33- and 50-volt current to the motherboard (see Figure 820) This connector was based on the motherboard power connector from the precursor of ATX, called AT The introduction of these two extra power connectors caused the industry some teething problems In particular, motherboards using AMD CPUs tended to need the AUX connector, whereas motherboards using Intel CPUs needed only the P4 As a result, many power supplies came with only a P4 or only an AUX connector to save money A few motherboard makers skipped adding either connector and used a standard Molex so people with older power supplies wouldn t have to upgrade just because they bought a new motherboard (Figure 821) The biggest problem with ATX12V was its lack of teeth it made a lot of recommendations but few requirements, giving PSU makers too much choice (such as choosing or not choosing to add AUX and P4 connectors) that weren t fixed until later versions EPS12V Server motherboards are thirsty for power and sometimes ATX12V 13 just didn t cut it An industry group called the Server System Infrastructure (SSI) developed a non-ATX standard motherboard and power supply called EPS12V An EPS12V power supply came with a 24-pin main motherboard power connector that resembled a 20-pin ATX connector, but it offered more current and thus more stability for motherboards It also came with an AUX connector, an ATX12V P4 connector, and a unique 8-pin connector That s a lot of connectors! EPS12V power supplies were not interchangeable with ATX12V power supplies EPS12V may not have seen much life beyond servers, but it introduced a number of power features, some of which eventually became part of the ATX12V standard The most important issue was something called rails.

getting information (data) in and out of the computer system If it weren t for data moving in and out, your computer would be a boring (and pretty useless) device! You need two items to make input/output work on your PC: a peripheral device and a way to connect that peripheral device to your system unit The typical desktop PC comes with a number of peripherals: keyboard, mouse, monitor, printer, speakers, and often a cable that runs to a network These peripherals all come with some form of cabling/ connection system Many of these connections are unique pairings For example, a monitor uses either a 15-pin Video Electronics Standards Association (VESA) also called Video Graphics Array (VGA) connector or a Digital Video Interface (DVI) connector, whereas a sound card uses Sony/Philips Digital Interface Format (S/PDIF) or mini-RCA connectors you won t see any other device commonly using these types of connectors CompTIA wants you to have a solid understanding of these types of peripherals and their unique connections: printers using parallel connections, networks using twisted-pair cabling, monitors using VGA or DVI, and speakers using miniRCA or S/PDIF Entire chapters of this lab manual address these specific peripherals in more detail, but there s much more to the world of input/ output than just those devices The most common PC input devices are keyboards and mice Other, more exotic input devices include scanners, touch screens, and biometric readers More general-purpose connections used by many types of peripherals include serial, USB, and FireWire This chapter takes a look at those other peripherals and connections that don t really fit well into any of the other chapters

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A few updates have been made to the ATX12V 20 standard, but these are trivial from a PC tech s standpoint

the system disk the disk that has Windows installed on it to another hard drive We ll talk more about how to increase system performance later in this book

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Operating systems are made to work on a particular type of CPU platform Microsoft Windows runs on the Intel and AMD x86 CPU family Software applications are likewise made to work on one type of OS (although some are ported to operate on more than one OS) The OS takes over control of the PC after POST and continues to run until you exit the OS or shut down the system An OS must be flexible enough to enable you to install new hardware and software Functions that are common to any OS include communicating with hardware, creating a user interface (a means for the user to issue instructions to the PC and retrieve information from it), enabling users to access application programs, and enabling users to create and manipulate data The user interface manifests in two ways: a text-only command line interface, and an icon-driven graphical user interface (GUI) Microsoft DOS is an example of a text-only command line interface OS, and modern versions of Microsoft Windows are GUI-based OSs GUI versions of Windows also offer command line interface access to the OS Different versions of Windows offer different features, but all versions have a common feature set The Windows user interface is the same or similar in all versions of Windows; it includes the login screen, the desktop, and the taskbar On networked systems, Windows places the My Network Places icon on the desktop or in the Start menu All versions of Windows use common OS files and folders, such as the system folder (the folder where the Windows OS files are stored), the Registry, and the virtual memory pagefile

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