4-12
A1SAM/A1SRM Series Motherboard User’s Manual
Legacy USB Support
Select Enabled to use legacy USB devices in the computer. Select Auto for your
BIOS to automatically enable legacy USB support if a legacy USB device is detected
in your computer. The options are
Enabled,
Disabled, and Auto.
EHCI Hand-Off
This item is for Operating Systems that do not support Enhanced Host Controller
Interface (EHCI) hand-off. When this item is enabled, EHCI ownership change will
be claimed by the EHCI driver. The settings are Enabled and
Disabled
.
USB Mass Storage Driver Support
Select Enabled for USB mass storage device support. The options are Disabled
and
Enabled
.
Port 60/64 Emulation
Select Enabled for I/O port 60h/64h emulation support. This feature should be
enabled for complete USB keyboard legacy support for non-USB-aware operating
systems. The options are Disabled and
Enabled
.
USB KB (Keyboard)/MS (Mouse) Wake
Select Enabled for the system to "wake-up" when a signal is received by the USB
keyboard or mouse. The options are
Disabled
and Enabled.
ACPI Settings
ACPI Settings
High Precision Timer
Select Enabled to activate the High Precision Event Timer (HPET) that produces
periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does in
synchronizing multimedia streams, providing smooth playback and reducing the de-
pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-
tion embedded in the CPU. The High Performance Event Timer is used to replace
the 8254 Programmable Interval Timer. The options are
Enabled
and Disabled.
WHEA Support
Select Enables to enable WHEA (Windows Hardware Error Architecture) support for
the Windows 2008 operating system (and later versions). The options are
Enabled
and Disabled.
