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Cross-Reference
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If you need a refresher on system resources, refer to the System Resources section in 6 of Mike Meyers A+ Guide to Managing and Troubleshooting PCs, Vol 1: Essentials
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Lab Exercise 602: Understanding System Resources
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Learning Objectives
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In this lab, you ll reinforce your knowledge of system resources At the end of this lab, you ll be able to Use the Device Manager to examine devices and determine what IRQs and I/O addresses are allocated to the device De ne the rules of assigning IRQs and I/O addresses, and state the default assignments for some common devices
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Lab Materials and Setup
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The materials you need for this lab are A working computer running Windows
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Hint
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As usual, if you have access to more than one system, take advantage of it
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Getting Down to Business
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In this exercise, you ll use the Device Manager to view the system resource settings on your PC Step 1 Open Windows Control Panel, and double-click the icon for the System applet Note that you can also access this applet by pressing the Windows key and the PAUSE/BREAK key at the same time On Windows 2000/XP systems, select the Hardware tab and then click the Device Manager button; this displays the Device Manager in a separate window (see Figure 6-5) Step 2 Device Manager shows you at a glance all of your system s IRQ, I/O, DMA, and memory address settings for each device In Windows 2000/XP, select View | Resources by type, and then expand the node for the resource type that you want to investigate (see Figure 6-6) Step 3 Select the option to view the input/output (I/O) settings on your system Scroll through the list to review and locate the addresses to answer these questions: What is the address for the keyboard _______________________________________________ What is the address for the printer port (LPT1) ______________________________________ What is the address for the real-time clock __________________________________________ What is the address for the communications port (COM1) _____________________________ What is the address for the system timer ____________________________________________
6: Understanding the Expansion Bus
FIGURE 6-5 Device Manager in Windows XP
FIGURE 6-6 Viewing system resources
Lab Analysis Test
Hint
On many new systems, the COM ports, LPT ports, and floppy disk drive are optional The resources that were traditionally assigned to these devices may not be displayed in the Device Manager
Step 4
Repeat Steps 1 3, this time looking at the IRQ settings
Does your system use IRQ 14 ________________________________ What device uses IRQ 14 ___________________________________ Step 5 Most seasoned techs (also known simply as old folks) know what the default system resource settings are for COM and LPT ports Compare the COM and LPT settings in the following table to the settings on your system Does your system list entries for all four devices ___________________________ Port COM1 COM2 LPT1 LPT2 I/O Address 3F8 2F8 378 278 IRQ 4 3 7 5
Lab Analysis Test
Microsoft has included a number of utilities or tools that give techs the ability to install, con gure, diagnose, and troubleshoot components Detail some of the features of the utility you have utilized in this lab John has a system that runs at 32 gigahertz (GHz) and uses a 128-megabyte (MB) AGP video card He uses Windows XP Professional and wants to try its multiple-monitor support feature Can he add another AGP video card Jennifer has just purchased the components for a new gaming system designed around an Intel Core 2 Duo processor, including a high-end AGP video card Why might this not be the best choice for the video card Based on the system described in the previous question, what type of video card might you recommend Jennifer purchase Chris, an older tech at your company, nds out you are studying for the CompTIA A+ certi cation and recommends you study all of the IRQs and I/O ports thoroughly Why might you explain to Chris that the IRQs and I/O ports have become less troubling on modern computers When would you still need to work with IRQs and I/O ports
4 5
6: Understanding the Expansion Bus
Key Terms Quiz
Use the following vocabulary terms to complete the sentences that follow Not all of the terms will be used
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