By Michael Pastore
The one classroom-based built-in examine approach for pro certification has been totally redesigned throughout--find out not just what to review, yet the way to examine. You’ll get a hundred% entire insurance of all goals for the A+ examination, thousands of perform examination questions, and hands-on workouts. The CD-ROM gains complete perform examination software program with interactive tutorials and lab simulations, plus an adaptive try engine.
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Additional resources for A+ Certification Study Guide, Fifth Edition (Certification Press)
The Monitor The function of a monitor is to produce visual responses to user requests. Most desktop computers use cathode ray tube (CRT) monitors or flat panel displays (FPD). CRTs use an electron gun to activate phosphors behind the screen. Each dot on the monitor, called a pixel, has the ability to generate red, green, or blue, depending on the signals it receives. This combination of colors results in the total display you see on the monitor. Monitors are available in a wide array of colors and resolutions.
These numbers are the contents of the registers and other key memory locations. This information is usually not overly useful to a computer technician, but it can provide a great deal of information to developers and technical support professionals as to the nature of the failure. It is a good idea to capture that information before you contact customer support. Memory Computer memory provides the primary storage for a computer system. The CPU will typically have internal memory (embedded in the CPU) that is used for operations and external memory located on the system or motherboard.
Storage Devices The function of all storage devices is to hold, or store, information, even when the computer’s power is turned off. Unlike information in RAM, files that are kept on a storage device remain there unless they are manually removed or altered by the user or the computer’s operating system. A great variety of storage devices are available, including floppy drives, hard drives, and Zip drives. However, the A+ tests focus only on the “standard” storage devices explained in the following sections.
A+ Certification Study Guide, Fifth Edition (Certification Press) by Michael Pastore