eyeball226: +1
For example if your monitor is widescreen and stretches the games in full screen, you can set the output resolution to your monitor's native res. DOSBox keeps the aspect ratio all nice.
Stelis: How is this done?
Warning, don't do any direct copying and pasting as Lhademmor found out the hard way. Also, make a backup before you edit this, especially if you're not sure what you're doing. In your .conf file go to the first bunch of options, should look something like this:
fullscreen=false
fulldouble=false
fullresolution=1366x768
windowresolution=original
output=ddraw
autolock=true
sensitivity=100
waitonerror=true
priority=highest,normal
mapperfile=mapper-0.74.map
usescancodes=true
Now, there's a bunch of interesting things you can do here. As you can see, I've changed "fullresolution" from "original" to the resolution of my laptop's screen, this would be different for you I'm imagining.
I believe that for scaling to work you have to change the output to something other than surface.I use ddraw but other options that support scaling are "overlay", "opengl" and "openglnb".
You can also change "fullscreen" from false to "true" if you want it to start in full screen. Not a big deal as you can switch with Alt+Enter anyway.
Warning, don't do any direct copying and pasting as Lhademmor found out the hard way.