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A device driver is a file stored on the PC s hard drive that contains all the commands necessary to talk to whatever device it was written to support All operating systems employ a method of loading these device drivers into RAM every time the system boots They know which device drivers to install by reading a file (or files) that lists which device drivers the system needs to load at boot time All operating systems are designed to look at this list early on in the boot process and copy the listed files into RAM, thereby giving the CPU the capability to communicate with the hardware supported by the device drivers Device drivers come with the device when you buy it When you buy a sound card, for example, it comes with a CD-ROM that holds all the necessary device drivers (and usually a bunch of extra goodies) The generic name for this type of CD-ROM is installation disc In most cases, you install a new device, start the Figure 527 Windows asking for the installation disc computer, and wait for Windows to prompt you for the installation disc (Figure 527) There are times when you might want to add or remove device drivers You can also access the Demanually Windows uses a special database called the registry that stores vice Manager by right-clicking everything you want to know about your system, including the device drivMy Computer and selecting ers You shouldn t access the registry directly to access these drivers, but inManage When the Computer stead use the venerable Device Manager utility (Figure 528) Management dialog box comes Using the Device Manager , you can manually change or remove the up, click on Device Manager drivers for any particular device You access the Device Manager by opening the System applet in the Control Panel; then select the Hardware tab and click the Device Manager button Make sure you know how to access the Device Manager You ll see lots more of the Device Manager as you learn about different types of devices in the rest of the book
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As you should now understand, every piece of hardware on a system must have an accompanying program that provides the CPU with the code necessary to communicate with that particular device This code may reside on the system ROM on the motherboard, on ROM on a card, or in a device driver file on the hard drive loaded into RAM at boot BIOS is everywhere on your system, and you will need to deal with it occasionally
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Typical Device Manager
5: Understanding BIOS and CMOS
5 Review
Summary
After reading this chapter and completing the exercises, you should understand the following about BIOS and CMOS
The ROM BIOS includes programs that enable the CPU to talk to many basic hardware devices such as the keyboard, but other devices not supported by the ROM BIOS may have their own ROM chips Each piece of hardware in the computer needs programs for everything that piece of hardware performs The CPU must access these programs to get the hardware to do its job IBM also devised other methods to get BIOS to the hardware of the computer If the hardware is common, necessary, and does not change, such as the keyboard, the system ROM chip stores the BIOS If the hardware is common and necessary but may change from time to time, such as when you install a larger hard drive or add more RAM, the BIOS for the general type of device (eg, a hard drive) can be on the system ROM chip The information describing specific features unique to that particular device (eg, a Seagate Barracuda 60-GB drive), however, must be stored on a changeable storage medium such as a complementary metal-oxide semiconductor (CMOS) chip
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