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AMI BIOS information
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5: Understanding BIOS and CMOS
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Okay, I ve thrown a whole bunch of terms at you describing various pieces of hardware and software and what does what to whom Here s the scorecard so you can sort out the various pieces of data
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The system ROM chip stores the system BIOS, programs needed by the CPU to communicate with devices holds the program that accesses the information stored on the CMOS chip to support changeable pieces of hardware This program is called the CMOS setup program or the system setup utility
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2 The system ROM chip also
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Award/Phoenix BIOS information
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3 The CMOS holds a small amount of data that describes the changeable pieces of hardware supported by the system BIOS The CMOS today is in the Southbridge chip of the chipset
Who or what is AMIBIOS, and who or what is Phoenix Technologies These are brand names of BIOS companies They write BIOS programs and sell them to computer manufacturers In today s world, motherboard makers rarely write their own BIOS Instead, they buy their BIOS from specialized third-party BIOS makers like Award Software and Phoenix Technologies Although several companies write BIOS, two big companies control 99 percent of the BIOS business: American Megatrends (AMI) and Phoenix Technologies Phoenix bought Award Software a few years ago and still sells the Award brand name as a separate product line These three are the most common brand names in the field You always access a system s CMOS setup program at boot The real question is, how do you access the CMOS setup at boot for your particular PC AMI, Award, and Phoenix use different keys to access the CMOS setup program Usually, BIOS manufacturers will tell you how to access the CMOS setup right on the screen as your computer boots up For example, at the bottom of the screen in Figure 513, you are instructed to Press DEL to enter SETUP Keep in mind that this is only one possible example Motherboard manufacturers can change the key combinations for entering CMOS setup You can even set up the computer so the message does not show a smart idea if you need to keep nosy people out of your CMOS setup! If you don t see an enter setup message, wait until the RAM count starts and then try one of the following keys or key combinations: DEL, ESC, F1, F2, CTRL-ALT-ESC, CTRL-ALT-INS, CTRL-ALT-ENTER, or CTRL-S It may take a few tries, but you will eventually find the right key or key combination! If not, check the motherboard book or the manufacturer s Web site for the information
It s perfectly fine to access the CMOS setup utility for a system, but do not make changes unless you fully understand that system!
A Quick Tour Through a Typical CMOS Setup Program
Every BIOS maker s CMOS setup program looks a little different, but don t let that confuse you They all contain basically the same settings; you just
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
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Accessing CMOS Setup
The key or key combination required to access CMOS setup varies depending on your particular BIOS It s important to know how to access CMOS setup, and how to find the BIOS information once you re in, so try this: 1 Boot your system and turn on your monitor Watch the information that scrolls by on the screen as your computer boots Most BIOS makers include a line indicating what key(s) to press to access the CMOS setup program Make a note of this useful information! You can also check your motherboard book to determine the process for accessing the CMOS setup program Reboot the system, and this time watch for information on the BIOS manufacturer If you don t see it, and if it s okay to do so, open the system case and check the name printed on the system ROM chip Make a note of this useful information Reboot one more time, and this time use the key or key combination you found to run the CMOS setup program Locate and make a note of the manufacturer, date, and version number of your PC s current BIOS If you can, make a note of the exact model information for your system and visit the Web site of the company that manufactured your PC Search their support files for the specs on your specific system and see if you can locate your BIOS information Now take the detailed BIOS information and search the BIOS manufacturer s Web site for the same information
have to be comfortable poking around To avoid doing something foolish, do not save anything unless you are sure you have it set correctly As an example, let s say your machine has Award BIOS You boot the system and press DEL to enter CMOS setup The screen in Figure 514 appears You are now in the Main menu of the Award CMOS setup program The setup program itself is stored on the ROM chip, but it edits only the data on the CMOS chip If you select the Standard CMOS Features option, the Standard CMOS Features screen appears (Figure 515) On this screen, you can change floppy drive and hard drive settings, as well as the system s date and time You will learn how to set up the CMOS for these devices in later chapters At this point, your only goal is to understand CMOS and know how to access the CMOS setup on your PC, Figure 514 Typical CMOS Main screen by Award 135
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