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Intel Desktop Board D810EMO/MO810E Technical Product Specification
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3.8 USB Legacy Support
USB legacy support enables USB devices such as keyboards, mice, and hubs to be used even when
no operating system USB drivers are in place. By default, USB legacy support is set to Auto.
USB legacy support is used in accessing the BIOS Setup program and installing an operating
system that supports USB.
This sequence describes how USB legacy support operates in the default (auto) mode.
1. When you power up the computer, USB legacy support is disabled.
2. POST begins.
3. USB legacy support is temporarily enabled by the BIOS. This allows you to use a
USB keyboard to enter the BIOS Setup program or the maintenance mode.
4. POST completes and disables USB legacy support (unless it was set to Enabled while in the
BIOS Setup program. Or if set to Auto while in the BIOS Setup program and a USB keyboard
or mouse is connected, then USB Legacy support will be enabled).
5. The operating system loads. While the operating system is loading, USB keyboards and mice
are not recognized (unless USB legacy support was set to Enabled while in the BIOS Setup
program, or if USB legacy support was set to Auto while in the BIOS Setup program and a
USB keyboard or mouse is connected). After the operating system loads the USB drivers, the
USB devices are recognized by the operating system.
To install an operating system that supports USB, enable USB Legacy support or set it to Auto in
the BIOS Setup program and follow the operating system’s installation instructions. Once the
operating system is installed and the USB drivers have been configured, USB legacy support is no
longer used. USB Legacy support can be left enabled or set to auto in the BIOS Setup program if
needed.
Notes on using USB legacy support:
• Do not use USB devices with an operating system that does not support USB. USB legacy is
not intended to support the use of USB devices in a non-USB aware operating system.
• USB legacy support is for keyboards, mice, and hubs only. Other USB devices are not
supported.