c# barcode scanner event Configuration of APM/ACPI in Software

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Configuration of APM/ACPI
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You configure APM/ACPI via CMOS settings or through Windows Windows settings will override CMOS settings Although the APM/ACPI standards permit a great deal of flexibility, which can create some confusion among different implementations, certain settings apply generally to CMOS configuration First is the ability to initialize power management; this enables the system to enter the APM Enabled mode Often CMOS will then present time frames for entering
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Standby and Suspend modes, as well as settings to determine which events take place in each of these modes Also, many CMOS versions will present settings to determine wake-up events, such as directing the system to monitor a modem or a particular interrupt request (IRQ) (Figure 129) A true ACPI-compliant CMOS provides an ACPI setup option Figure 1210 shows a typical modern BIOS that provides this setting APM/ACPI settings can be found in the Windows 2000/XP Control Panel s Power Options applet The Power Options applet has several built-in power schemes such as Home/Office and Max Battery (Figure 1211) that put the system into Standby or Suspend mode after a certain interval You can also require the system to go into Standby mode after a set period of time or turn off the monitor or hard drive after a time, thus creating your own custom power scheme
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You can also access Power Options by right-clicking the desktop and choosing Properties, and then opening the Screen Saver tab Click the Power button in the Monitor Power section of the Screen Saver tab
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Another feature, Hibernate mode, takes everything in active memory and stores it on the hard drive just before the system powers down When the PC
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FIGURE 129
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Setting a wake-up event in CMOS
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CHAPTER 12 Portable Computers
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FIGURE 1210
CMOS with ACPI setup option
comes out of hibernation, Windows reloads all the files and applications into RAM Figure 1212 shows the Power Options Properties screen s Hibernate tab in Windows XP
FIGURE 1211
Power Options Power Schemes tab
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FIGURE 1212
Power Options Hibernate tab
Objective 1203
Power
he thing that makes portable computers portable is their mobile power source: the battery But all portables come with some sort of AC adapter to charge the battery and to provide primary power when the battery is depleted, missing, or simply not desired Three types of batteries are commonly used in portable PCs, handhelds, and PDAs: nickel-cadmium, nickel-metal hydride, and lithium-ion
Nickel-Cadmium
Nickel-Cadmium (Ni-Cd) batteries were the first type of battery able to provide portable computers with the steady supply of voltage that they need and were widely used in early portable PCs However, Ni-Cds were far from an ideal solution For one thing, they weren t capable of holding a sufficient charge to power the computer for more than a couple of hours even under the best of conditions Real-life usage with frequent hard drive and CD-ROM activity drained Ni-Cd batteries in about half that time Another problem that plagued Ni-Cds is something called battery memory
CHAPTER 12 Portable Computers
Battery memory is a tendency for Ni-Cd batteries to remember the level at which they are usually discharged before they are recharged For example, if you consistently use up a battery s charge to about 70 percent of its capacity before hooking it up to a charger, eventually the battery will start behaving as if it needs to be recharged at 70 percent capacity, thereby wasting the remaining 30 percent! To prevent memory problems, a Ni-Cd battery had to be discharged completely before each recharging Another fix was to purchase a conditioning charger, which would first totally discharge the Ni-Cd battery and then generate a special reverse current that electrically cleaned the internal parts of the battery Another knock against Ni-Cd batteries is that they re not very robust They would, at best, last for about 1000 charges, and far fewer if they were subjected to rough use Ni-Cds were also sensitive to overcharging a very real danger because Ni-Cd chargers aren t very smart about determining how much of a charge the battery requires Ni-Cds were also extremely susceptible to high temperatures, so storing your laptop in the trunk of a car for more than a few hours would usually result in a dead battery Ni-Cd batteries didn t stop causing trouble after they died The highly toxic metals inside the battery made it unacceptable to throw them in the trash Ni-Cd batteries must be disposed of via specialized disposal companies most recycling centers and many battery manufacturers and distributors are glad to take them For the most part, Ni-Cd batteries aren t used in computer devices much anymore, although you ll still find them in many consumer electronics devices
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