you need to create a config, then edit it, and fiddle with render and another video options, read the readme of 0.72 😀

Hello young man. How "centered" and how big are the black borders? My guess is that you need to fiddle with the output-method in dosbox.conf. Try them all (surface, overlay, ddraw, opengl, ...) and see if one of them will do the trick.

If you are using an old laptop, your monitor may only be able to handle low resolutions with centering and may not be able to scale it.

I was going to make a new topic, but it turns out I've got the same issues as this "old man" (heh).

I've tried fiddling with my DOSBox configuration and nothing works right. I've read the documentation, and looked at the dosbox.conf file, but I can't seem to figure out how to do this. My regular resolution is 1280x1024, but the game runs at 640x480 and is surrounded by black borders. I have tried several games (DOS demos from CDs, Police Quest 1 VGA remake, and a few Ted Gruber software titles) and they all seem to have the same issue. Any help is appreciated. My configuration is below (I've omitted all other options.)

[sdl]
fullscreen=false
fulldouble=false
fullresolution=1280x1024
windowresolution=original
output=surface
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper.txt
usescancodes=true

[render]
frameskip=0
aspect=false
scaler=normal2x

Edited to add resolution / game info.

MiniMax wrote:

Hello young man. How "centered" and how big are the black borders? My guess is that you need to fiddle with the output-method in dosbox.conf. Try them all (surface, overlay, ddraw, opengl, ...) and see if one of them will do the trick.