User`s manual

BIOS Setup
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2-6 Peripherals
& IOMMU
 EnablesordisablesAMDIOMMUsupport.(Default:Disabled)
& OnChip USB Controller
 EnablesordisablestheintegratedUSBcontroller.(Default:Enabled)
& HD Audio Azalia Device
 Enablesordisablestheonboardaudiofunction.(Default:Enabled)
If you wish to install a 3rd party add-in audio card instead of using the onboard audio, set this item to
Disabled.
& Legacy USB Support
 AllowsUSBkeyboard/mousetobeusedinMS-DOS.(Default:Enabled)
& XHCI Hand-off
 Determines whetherto enable XHCI Hand-offfeature for an operating systemwithout XHCI Hand-off
support.(Default:Enabled)
& EHCI Hand-off
Determines whether to enable EHCI Hand-off feature for an operating system without EHCI Hand-off
support.(Default:Disabled)
& Port 60/64 Emulation
Enables or disables emulation of I/O ports 64h and 60h. This should be enabled for full legacy support
for USB keyboards/mice in MS-DOS or in operating system that does not natively support USB devices.
(Default:Disabled)
& USB Storage Devices
Displays a list of connected USB mass storage devices. This item appears only when a USB storage device
is installed.