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Simply placing a number of components into a computer is useless if the CPU can t communicate with them Getting the CPU to communicate with a device starts with some kind of interconnection a communication bus that enables the CPU to send commands to and from devices To make this connection, let s promote the MCC, giving it extra firepower to act as not only the interconnection between the CPU and RAM, but also the interconnection between the CPU and the other devices on the PC The MCC isn t just the memory controller anymore, so let s now call it the Northbridge because it acts as the primary bridge between the CPU and the rest of the computer (Figure 51) Your PC is full of devices, so the PC industry decided to delegate some of the interconnectivity work to a second chip called the Southbridge The Northbridge only deals with high-speed interfaces such as the connection to your video card and RAM The Southbridge works mainly with lower-speed devices such as the USB controller and hard drive controllers Chip makers design matched sets of particular models of Northbridge and Southbridge to work together You don t buy a Northbridge from one company and a Southbridge from another they re sold as a set We call this set of Northbridge and Southbridge the chipset The chipset extends the data bus to every device on the PC The CPU uses the data bus to move data to and from all the devices of the PC Data constantly flows on the external data bus among the CPU, chipset, RAM, and other devices on the PC (Figure 52) The first use for the address bus, as you know, is for the CPU to tell the chipset to send or store data in memory and to tell the chipset which section of memory to access or use Just like with the external data bus, the chipset extends the address bus to all the devices, too (Figure 53) That way, the CPU can use the address bus to send commands to devices, just like it sends commands to the chipset You ll see this in action a lot more in 6, Understanding the Expansion Bus, but for now just go with the concept It s not too hard to swallow the concept that the CPU uses the address bus to talk to the devices, but how does it know what to say to them How does it know all of the different patterns of ones and zeroes to place on the address bus to tell the hard drive it needs to send a file Let s look at the interaction between the keyboard and CPU for insight into this process.

Jane s PC, fourth cubicle on the left She says the PC has locked up on her, and she can t even turn it off! Don t change anything or open it up Right now I simply need to know if it will shut down, boot properly, and access the drives Then the IT manager is off to deal with her crisis, and you re on the spot

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can switch to Category View (the default) by selecting the appropriate option (top left) Under normal circumstances, everything necessary to configure the system is handled from the Control Panel, and few occasions require direct Registry access Nevertheless, all good techs should know how to access, navigate, and when necessary edit the system Registry Microsoft provides tools for doing this the Registry Editor Launch the Registry Editor by choosing Start | Run and typing regedit or regedt32 In Windows 2000, the two commands open 16-bit and 32-bit versions of the Registry Editor, respectively The commands are interchangeable in Windows XP, opening only the 32-bit version of the Registry Editor Figure 1517 shows the 16-bit (top) and 32-bit versions of Registry Editor

The keyboard provides a great example of how the buses and support programming help the CPU get the job done In early computers, the keyboard connected to the

Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)

The Registry files are binary You cannot edit the Registry with Edit, Notepad, or any other text editor as you could with SYSTEMINI You must use the Registry Editor tool

This exercise looks at the many PC components that you can access without removing the case You can use a quick scan to determine whether a PC is functioning properly at the most basic level Take your time, and jot down notes where you feel the need Practice each step until you re con dent you can do it on the job as a PC tech

external data bus via a special chip known as the keyboard controller Don t bother looking for this chip on your motherboard the keyboard controller functions are now handled by the Southbridge The way the keyboard controller or technically, the keyboard controller circuitry works

Registry Components The Registry is a hierarchical database, organized in a tree structure similar to the folders in the PC Open the Registry Editor (16-bit version), and you ll see six main subgroups or root keys:

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