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The U3 Upgrade currently has one configuration file:

This is a seven-byte file where each byte represents the status of an upgrade-specific feature:

Index	Description	Values	Default
0	video	0=cga, 1=cgacomp, 2=ega, 3=vga	3
1	music	0=nomidi, 1=midpak	1
2	autosave	0=disabled, 1=enabled	0
3	frame limiter	0=disabled, 1=enabled	1
4	moon phases	0=disabled, 1=enabled	1
5	gameplay fixes	0=disabled, 1=enabled	1
6	sound effects	0=sfx, 1=sfxtimed	1