MSI IM-945GSE SERIES MS-9830 - Manual (Page 63)

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BIOS Setup
USB Configuration
Legacy USB Support
Set to [Enabled] if your need to use any USB device in the operating system that
does not support or have any USB driver installed, such as DOS and SCO Unix.
Set to [Disabled] only if you want to use any USB device other than the USB
mouse.
BIOS EHCI Hand-Off
This setting allows you to enable or disable a workaround for operating sys-
tems without EHCI (Enhanced Host Controller Interface) hand-off support. 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.
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