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ACPI/PC 98 Features
ACPI stands for Advanced Configuration and Power Interface. The ACPI speci-
fication defines a flexible and abstract hardware interface that provides a stan-
dard way to integrate power management features throughout a PC system,
including hardware, operating system and application software. This enables the
system to automatically turn on and off peripherals such as CD-ROMs, network
cards, hard disk drives, and printers. This also includes consumer devices
connected to the PC such as VCRs, TVs, phones, and stereos.
In addition to enabling operating system-directed power management, ACPI pro-
vides a generic system event mechanism for Plug and Play and an operating
system-independent interface for configuration control. ACPI leverages the Plug
and Play BIOS data structures while providing a processor architecture-indepen-
dent implementation that is compatible with both Windows 98 and Windows NT
5.0.
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 off and responds immediately to user
or other requests.
Slow Blinking LED for Suspend-State Indicator
When the CPU goes into a suspend state, the 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
The PC is perceived to be off when not in use, but 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.
Chapter 1: Introduction
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