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ROM Motherboards store the keyboard controller support programming, among other programs, on a special type of device called a read-only memory (ROM) chip A ROM chip stores programs exactly like RAM: that is, like an 8-bit-wide spreadsheet But ROM differs from RAM in two important ways First, ROM chips are non-volatile , meaning that the information stored on ROM isn t erased when the computer is turned off Second, traditional ROM chips are read-only, meaning that once a program is stored on one, it can t be changed Modern motherboards use a type of ROM called flash ROM that differs from traditional ROM in that you can update and change the contents through a very specific process called flashing the ROM Figure 58 shows a typical flash ROM chip on a motherboard When the CPU wants to talk to the Figure 58 Typical flash ROM keyboard controller, it goes to the flash ROM chip to access the proper programming (Figure 59) Every motherboard has a flash ROM, called the system ROM chip because it contains code that enables your CPU to talk to the basic hardware of your PC As alluded to earlier, the system ROM holds BIOS for more than just the keyboard controller It also stores programs for communicating with the floppy drives, hard drives, optical drives, video, USB ports, and other basic devices on your motherboard

As a technician, you need to know how everything works on a PC The best place to begin is with the externally accessible devices Step 1 Before you can do much work with a PC, you need a functioning output device, such as a monitor Check the monitor to see if it has power The small light emitting diode, or LED, on or near the monitor s power button, should be lit: orange means the system is turned off or asleep; green means the system is fully on If you determine that the monitor is not plugged into a wall outlet, plug it in now Step 2 Look at the front of your system unit Locate the power button Compare your button to the one in Figure 2-1 Once you have located the power button on your system, make a note of its appearance Is it in plain sight or hidden behind a door or lid Is it round, square, or some odd shape Pressing the power button to start a PC when the power is off is known as a cold boot or sometimes a hard boot Describe your power button here ________________________________________________________________________ Sometimes, software will lock up your system, and the only way to shut the system down is to force a power-down This requires that you press and hold the power button for four to six seconds Notice the two LEDs on the front panel near the power button One will generally light up green to indicate that the power is on, and the other will ash when the internal hard drive is active

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Virtual memory, Swapfile, Pagefile All these terms refer to the same thing: space on the hard drive reserved as temporary storage for running programs Swapping programs between RAM and virtual memory takes time, because compared to RAM, the hard drive is painfully slow You may notice a reduction in performance if a lot of paging activity is occurring To counter this performance hit, you can do the following:

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

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Because virtual memory is brought heavily into play only when there s not enough RAM to accommodate running programs, you can decrease paging by adding more RAM to the system You can change the location of the pagefile If you have more than one hard drive, you can increase performance by moving the pagefile from

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