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a PC system, including its hardware, operating system and application soft-
ware. This enables the system to automatically turn on and off peripherals
such as CD-ROMs, network cards, hard disk drives and printers.
In addition to enabling operating system-directed power management, ACPI
provides a generic system event mechanism for Plug and Play and an oper-
ating system-independent interface for configuration control.
ages the Plug and Play BIOS data structures while providing a processor
architecture-independent implementation that is compatible with Windows
98. Note: 1. Windows NT 4.0 does not support ACPI. 2. To install Windows
98 with ACPI, enter DOS and type "setup /p j" at the CDROM prompt (usually
D:\) with the Windows 98 CD loaded. (Make sure you include the spaces
after "setup" and "p".) Then hit <Enter>. You can check to see if ACPI has
been properly installed by looking for it in the Device Manager, which is
located in the Control Panel in Windows.
Microsoft OnNow
The OnNow design initiative is a comprehensive, system-wide approach to
system and device power control. OnNow is a term for a PC that is always
on but appears to be off and responds immediately to user or other re-
quests.
Slow Blinking LED for Suspend-State Indicator
When the CPU goes into a suspend state, the chassis power LED will start
blinking to indicate that the CPU is in suspend mode. When the user presses
any key, the CPU will wake-up and the LED will automatically stop blinking
and remain on.
BIOS Support for USB Keyboard
If the USB keyboard is the only keyboard in the system, the USB keyboard
will work like a normal keyboard during system boot-up.
Real Time Clock Wake-Up Alarm
Although the PC may be perceived to be off when not in use, it is still
capable of responding to preset wake-up events. In the BIOS, the user can
set a timer to wake-up the system at a predetermined time (see page 4-13).
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Chapter 1: Introduction
ACPI lever-
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