MSI MS-9A66, User Manual, Page: 63 / 108

3-7
BIOS Setup MS-9A66
▶ PCI/PCIE Device Configuration
▶ EHCI1, EHCI2
This setting disables/enables the USB EHCI controller. The Enhanced Host
Controller Interface (EHCI) specification describes the register-level interface
for a Host Controller for the Universal Serial Bus (USB) Revision 2.0.
▶
XHCI Mode
This setting disables/enables the USB XHCI controller. The eXtensible Host
Controller Interface (XHCI) is a computer interface specification that defines
a register-level description of a Host Controller for Universal Serial bus
(USB), which is capable of interfacing to USB 1.0, 2.0, and 3.0 compatible
devices. The specification is also referred to as the USB 3.0 Host Controller
specification.
▶
Legacy USB Support
Set to [Enabled] if you need to use any USB 1.1/2.0 device in the operating
system that does not support or have any USB 1.1/2.0 driver installed, such
as DOS and SCO Unix.
▶ Boot Up Beep
Beep codes are used by the BIOS during the POST to report certain initial
system errors. Use this setting to disable/enable the system boot up beep.
▶
Audio Controller
This setting enables/disables the onboard audio controller.
▶ Launch OnChip/OnBoard LAN OpROM
These settings enable/disable the initialization of the onboard/onchip LAN
Boot ROM during bootup. Selecting [Disabled] will speed up the boot process.