DFI NP100-N16C - Manual (Page 75)

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BIOS Setup
USB Mouse Function
Due to the limited space of the BIOS ROM, the support for legacy USB mouse
(in DOS mode) is by default set to Disabled. With more BIOS ROM space
available, it will be able to support more advanced features as well as provide
compatibility to a wide variety of peripheral devices.
If a PS/2 mouse is not available and you need to use a USB mouse to install
Windows (installation is performed in DOS mode) or run any program under
DOS, set this field to Enabled.
USB Storage Function
This field is used to enable or disable the support for legacy USB mass stor-
age.