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It is very common for techs to talk about various functions of the chipset as if those functions were still handled by discrete chips So you ll hear about memory controllers, keyboard controllers, mouse controllers, USB controllers, and so on, even though they re all just circuits on the Northbridge or Southbridge chips

Even though the model numbers changed over the years, you ll still hear techs refer to the keyboard controller as the 8042, after the original keyboard controller chip

Try opening one of these root keys, and note that more subkeys are listed underneath them Many subkeys also have other subkeys or values The secret to understanding the Registry is to understand the function of the six root keys first Each of these root keys has a specific function, so let s take a look at them individually:

In this lab exercise, you will locate and describe the various cabinet parts, user controls, and builtin user-accessible devices of a PC system You will not be opening the system case during this lab At the end of this lab, you ll be able to Recognize and manipulate user controls Describe the use of built-in user-accessible devices

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with the CPU, however, has changed only a small amount in the last 20+ years, making it a perfect tool to see how the CPU talks to a device The keyboard controller was one of the last single-function chips to be absorbed into the chipset For many years in fact, well into the Pentium III/Early Athlon era most motherboards still had separate keyboard controller chips Figure 54 shows a typical keyboard controller from those days Electronically, it looked like Figure 55 Every time you press a key on your keyboard, a scanning chip in the keyboard notices which key has been pressed Then the scanner sends a coded pattern of ones and zeroes called the scan code to the keyboard controller Every key on your keyboard has a unique scan code The keyboard controller stores the scan code in its own register Does it surprise

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

HKEY_CLASSES_ROOT This root key defines the standard class objects used by Windows A class object is a named group of functions Pretty much everything that has to do with files on the system is defined by a class object

you that the lowly keyboard controller has a register similar to a CPU Lots of chips have registers not just CPUs! (See Figure 56) How does the CPU get the scan code out of the keyboard controller (See Figure 57) While we re at it, how does the CPU tell the keyboard to change

The materials you need for this lab are One fully functioning desktop computer system unit with monitor A working CD or DVD drive One readable data CD with les One keyboard One mouse A notepad on which to take notes and make sketches of the computer and components A digital camera to take photos of the computer and components (optional)

HKEY_USERS and HKEY_CURRENT_USER Windows can be configured to support more than one user on the same PC, storing personalized information such as colors, screen savers, and the contents of the desktop HKEY_USERS stores all of the personalization information for all users on a PC HKEY_CURRENT_USER stores the current user settings, such as fonts, icons, and colors on systems that are set up to support multiple users

the typematic buffer rate (when you hold down a key and the letter repeats) or turn the number lock LED on and off, to mention just a few other jobs the keyboard needs to do for the system The point is that the keyboard controller must be able to respond to multiple commands, not just one The keyboard controller accepts commands exactly as you saw the CPU accept commands in 3 Remember when you added 2 to 3 with the 8088 You had to use specific commands from the 8088 s codebook to tell the CPU to do the addition and then place the answer on the external data bus The keyboard controller has its own codebook much simpler than any CPU s codebook, but conceptually the same If the CPU wants to know what key was last pressed on the keyboard, the CPU needs to know the command (or series of commands) that orders the keyboard controller to put the scan code of the letter on the external data bus so the CPU can read it

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