You can see the io addresses for all of the devices

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Unformatted text preview: pter 8 All-In-One Chapter 8: Expansion Bus 301 Figure 8-14 Sending out an I/O address preset by standard (for example, all hard drive controllers use the same I/O addresses on every PC) or are set at boot by the operating system. You can see the I/O addresses for all of the devices on your computer by going into the Device Manager. Go to the View menu option and select Resources by type. Click on the plus sign directly to the left of the Input/output (IO) option to see a list of I/O addresses, as shown in Figure 8-15. Figure 8-15 Viewing resources by type, with I/O addresses expanded ch08.indd 301 12/14/09 2:49:23 PM All-In-One / CompTIA Network+ All-in-One Exam Guide / Meyers & Jernigan / 170133-8 / Chapter 8 CompTIA A+Certification All-in-One Exam Guide 302 Whoa! What’s with all the letters and numbers? The address bus is always 32 bits (even if you have a 64-bit processor, the Northbridge only allows the first 32 bits to pass to the expansion slots), so instead of showing you the raw ones and zeroes, the Device Manager shows you the I/O address ranges in hexadecimal. Don’t know hex? No worrieshexadecimal is just quick shorthand for representing the strings of ones and zeroes—binary—that you do know. One hex character is used to represent four binary characters. Here’s the key: 0000 = 0 0001 = 1 0010 = 2 0011 = 3 0100 = 4 0101 = 5 0110 = 6 0111 = 7 1000 = 8 1001 = 9 1010 = A 1011 = B 1100 = C 1101 = D 1110 = E 1111 = F Let’s pick an arbitrary string of ones and zeroes: 00000000000000000000000111110000 To convert to hex, just chop them into chunks of four: 0000 0000 0000 0000 0000 0001 1111 0000 Then use the key above to convert: 000001F0 Then push the hex values together: 000001F0 ch08.indd 302 12/14/09 2:49:23 PM All-In-One / CompTIA Network+ All-in-One Exam Guide / Meyers & Jernigan / 170133-8 / Chapter 8 All-In-One Chapter 8: Expansion Bus 303 You now understand what those values mean in the Device Manager. Scroll down until you find the “[000001F0 – 000001F7] Primary IDE Channel” setting. Notice that two I/O address...
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