Using an NVidea card. It can do this, but I thought DosBox was able to do this too? Would be much easier if I could do this in the config file, than having to manually change the resolution of the host PC every time (and switching it back afterwards).
With these parameters you can nicely double the 640x480 resolution, and dosbox will put black borders on the top, bottom and sides to get a sharp result.
I'd like to have something like fullresolution=640x480 with "scaler = normal1x" (this doesn't exist, off course).