EVGA 121-BL-E756 - Manual (Page 47)

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‰ USB Operation Mode
Select the USB Operation Mode for USB device. Options are Full/Low
Speed and High Speed.
‰ USB Keyboard Function
Use this function to enable or disable support for USB keyboard under DOS.
‰ USB Mouse Function
Use this function to enable or disable support for USB mouse under DOS
‰ USB Storage Function
Use this function to enable or disable legacy support of USB Mass Storage