By Michael Pastore
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Additional resources for A+ Certification Study Guide, Fifth Edition (Certification Press)
To prevent damage to the system, you must equalize the electrical charge between your body and the components inside your computer. Touching a grounded portion of your computer’s chassis will work to some extent, but for complete safety, use an antistatic wristband with a ground wire attached to the computer frame. Leave servicing high-voltage peripherals such as monitors and power supplies to technicians trained in that area. Even when left unplugged for an extended period, enough voltage can be stored to cause severe injury, or even death.
The 478 refers to the number of pins that the processor uses to connect to the motherboard. The Pentium 4 also has a 423-pin version available for systems integrators. Older PGA configurations did not typically require additional cooling, while all new processors require extensive heat sinks and fans. These new processors will only operate for a few minutes before they malfunction if the cooling system is not installed and working. The Power Supply The power supply (shown in Figure 1-4), typically located at the back of the computer’s interior, has several very important functions.
A more detailed discussion about memory occurs in the section on CPUs. Controllers The CPU also contains a number of interfaces or controllers to access devices and busses. One of the primary functions of a controller is to free up the time of the control unit by performing routine or clearly identified tasks. A typical microprocessor will have controllers interface to slow-speed devices such as serial data connections, high-speed interfaces connect to a computer bus, and connections to dedicated registers contain and report status.
A+ Certification Study Guide, Fifth Edition (Certification Press) by Michael Pastore