Asus Vintage - Manual (Page 84)

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Exit & Save Changes
Once you are finished making your selections, choose this option from the
Exit menu to ensure the values you selected are saved to the CMOS RAM.
The CMOS RAM is sustained by an onboard backup battery and stays on
even when the PC is turned off. When you select this option, a
confirmation window appears. Select [Yes] to save changes and exit.
If you attempt to exit the Setup program without saving your changes, the
program prompts you with a message asking if you want to save your
changes before exiting. Pressing saves the changes while
exiting.
5.7 Exit menu
The Exit menu items allow you to load the optimal or failsafe default values
for the BIOS items, and save or discard your changes to the BIOS items.
Pressing does not immediately exit this menu. Select one of the
options from this menu or from the legend bar to exit.
Exit Options
Exit & Save Changes
Exit & Discard Changes
Discard Changes
Load Setup Defaults
Exit system setup after
saving the changes.
F10 key can be used for
this operation.