DOSBox - how do I get a larger (not full) screen

I’ve done some poking around and can’t find an answer.

I’m running a second monitor off my laptop as my only monitor. Setting DOSBOX to full screen sends the output to the laptop’s monitor. I don’t want that. I have determined that this problem is insoluble.

OK, so I want the screen to take up more than the 1/8 of my monitor that it currently does. I’ve played around with the dosbox-0.74.conf file. From what I picked up from the internet, the fullresolution and windowresolution options are what I want to mess with, but whatever I change them to has no effect. One of the examples showed the output option set to opengl, and when I did that (in conjunction with setting the other two to, for example, 640x480) I got a larger screen, but no command prompt.

Any ideas?

(If it helps, I’m wanting to play a very old DOS version of Romance of the Three Kingdoms. It plays in that very small window just fine, but my eyes can’t pick up the main map details of battles, floods, etc. in such a small viewing area. I need it to take up more area on my monitor.)

You were on the right track with windowresolution but you apparently have to change the output variable to overlay or opengl along with the resolution change.

These two settings changed DOSBox to 800x600 but it wasn’t very pretty:

Do you know what resolutions your game can run? Try to match the windowresolution to the highest resolution the game will run, if DOSBox isn’t already doing that. Hopefully the game will let you run higher than 320x240 or 648x480. You will probably be disappointed in how older DOS games scale though, they are mostly raster graphics made for a fixed resolution and will get blocky quick if you upscale them.

That’s fine. The screen is static both on the main map and on the state level info map. The only action is when one state invades another (a brief highlighting of each) or between seasons when there is a flood, revolt, plague, etc. in a state (a brief change of color in the affected state). The particular spot where those brief changes are occurring is what I can’t pick out on such a small screen.

The problem is that when using opengl, I didn’t have a command prompt. Maybe I could try it with the appropriate commands to open the game embedded in the .conf file.

Which particular version of Romance?

In addition to the opengl mode, try ddraw too. Also try setting your resolution to an even multiple of 320x240 (640x480, 1280x960, etc.). And if you want the upsampling to look better, you can change the scaler settings: Scaler - DOSBoxWiki

I was able to get the command prompt bigger in a window, but I couldn’t get Romance of the Three Kingdoms 3 to run – it just freezes at startup, a white tiger background. Which one are you trying?