I don't like default dosbox configuration for this game. It launches fullscreen, but with game only in a small window centered (surrounded by black area/background). For old games I prefer real full screen, I don't afraid of low resolution; windows kill immersion :) But in this specific case I don't know how to edit dosbox config.

What I achieved is a partial solution:
1. Go to game folder.
2. Edit dosboxSlip5k.conf.
3. Replace scaler=normal2x with scaler=normal3x.

In my case it makes the game window bigger and black border narrower, but it's still not a proper full screen mode. Anyone knows how to make the game to work in real full screen mode?