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Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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system (OS) Microsoft Windows is the most popular OS today, but there are other computer operating systems, such as Apple Macintosh OS X (Figure 22) and the popular (and free) Linux Computer people lump operating systems and applications into the term software to differentiate them from the hardware of the computer Understanding the computer at this broad conceptual level in terms of hardware, OS, and programs can help you explain things to customers, but good techs have a much more fundamental appreciation and understanding of the complex interplay of all the software and the individual pieces of hardware In short, techs need to know the processes going on behind the scenes From the CompTIA A+ tech s perspective, the computer functions through four stages: input, processing, output, and storage Knowing which parts participate in a particular stage of the computing process enables you to troubleshoot on a fundamental and decisive level
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The CompTIA A+ certification exams focus on hardware and operating systems; other certifications cover many of the programs in common use today Two examples are the Microsoft Office Specialist (MOS) and Macromedia Certified Professional certifications
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Input
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To illustrate this four-step process, let s walk through the steps involved in a fairly common computer task: preparing your taxes [Insert collective groan here] February has rolled around and, at least in the United States,
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Figure 22
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2: The Visible PC
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millions of people install their favorite tax software, TurboTax from Intuit, onto their computers to help them prepare their taxes (Figure 23) After starting TurboTax, your first job is to provide the computer with data essential information, such as your name, where you live, how much you earned, and how many dollars you gave to federal and state governments Various pieces of hardware enable you to input data, the most common of which are the keyboard and mouse Most computers won t react when you say, Hey you! at least anywhere outside of a Star Trek set Although that day will come, for now you must use something decidedly more mechanical: a keyboard to type in your data The OS provides a fundamental service in this process as well You can bang on a keyboard all day and accomplish nothing without the OS translating your keystrokes into code that the hardware can understand
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Figure 23
Processing
TurboTax is an example of software
Next, the computer processes your data It places information in various appropriate boxes in TurboTax, and then it does the math for you Processing takes place inside the system unit the box under your desk and happens almost completely at a hardware level, although that hardware functions according to rules laid out in the OS Again you have a complex interaction between hardware and software The processing portion is the magical part you can t see it happen The first half of this book demystifies this stage because good techs understand all the pieces of the process I won t go through the specific hardware involved in the processing stage here because the pieces change according to the type of process
Output
Simply adding up your total tax for the year is useless unless the computer shows you the result That s where the third step output comes into play Once the computer finishes processing data, it must put the information somewhere for you to inspect it Often it places data on the monitor so you can see what you ve just typed It might send the data over to the printer if you tell it so you can print out copies of your tax return to mail to the Internal Revenue Service (or whatever the Tax Man is called where you live) A hardware device does the actual printing, but the OS controls the printing process Again, it s a fundamental interaction of hardware and software
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