A+ Guide to Hardware: Managing, Maintaining and by Jean Andrews

By Jean Andrews

Written via best-selling notebook fix writer and educator Jean Andrews, the 5th variation of A+ advisor to undefined: dealing with, protecting, and Troubleshooting maps absolutely to CompTIA's 2009 A+ examination goals. This full-color advisor is the main whole, step by step e-book on hand for studying the basics of assisting and troubleshooting desktop undefined. while, it prepares readers to effectively go the A+ 220-701 and 220-702 tests. the hot variation is formatted to aid any instructing or studying sort and direction layout, that includes an essentials-to-practical association inside each one bankruptcy and inclusion of tabs distinguishing examination content material. additional content material and dwell demonstrations with Jean Andrews can be found at the accompanying CD, making this re-creation a complete answer for upkeep and service.

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Sample text

These data and instructions are also permanently stored on devices, such as DVDs, CDs, hard drives, and USB drives, in locations that are remote from the CPU. Data and instructions cannot be processed by the CPU from this remote storage (called secondary storage), but must first be copied into primary storage (RAM) for processing. The most important difference between primary and secondary storage is that secondary storage is permanent. When you turn off your computer, the information in secondary storage remains intact.

The most common coding method for text is ASCII (American Standard Code for Information Interchange). For example, the uppercase letter A in ASCII code is 0100 0001 (see Figure 1-3). The number 25 stored as 8 bits using the binary number system: 25 = 0001 1001 = The letter A stored as 8 bits using ASCII code: A= 0100 0001 = Figure 1-3 All letters and numbers are stored in a computer as a series of bits, each represented in the computer as on or off Courtesy: Course Technology/Cengage Learning A+ Exam Tip The A+ 220-701 Essentials exam expects you to know all the key terms in this chapter.

Primary storage temporarily holds both data and instructions as the CPU processes them. These data and instructions are also permanently stored on devices, such as DVDs, CDs, hard drives, and USB drives, in locations that are remote from the CPU. Data and instructions cannot be processed by the CPU from this remote storage (called secondary storage), but must first be copied into primary storage (RAM) for processing. The most important difference between primary and secondary storage is that secondary storage is permanent.

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