Eurocom A9100 Uno 2.0 - Manual (Page 74)

BIOS Utilities
5 - 10 Advanced Menu
5
Legacy OS Boot (Advanced Menu)
If “Enabled” the system will attempt to load the Legacy OS (e.g. Windows 7) first.
If set to “Disabled” the system will attempt to EFI (Extensible Firmware Interface)
boot before the Legacy OS.
Power On Boot Beep (Advanced Menu)
Use this menu item to enable/disable the beep as the computer starts up.