Emulator has max res 800x480 and I don't see any problems
Btw, your assumption and values are wrong. When you write higher dpi value, it is actually much smaller details.
Lower dpi values make picture much bigger > extends beyond the screen...
Write this in sys:
[rawdisplay]
driver="GDI"
dpi=280
screen_x=800
screen_y=480
You can also play with base_dpi parameter.
Example:
For 1024x600, values are
[rawdisplay]
dpi=300
base_dpi=240
For 1280x1200
[rawdisplay]
dpi=380
base_dpi=280
etc...
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