You need to place and execute (via autoexec in dosbox config) a rover.sys file. I remember that there have been multiple of threads about it + many posts in this very thread, but I don't have it bookmarked anywhere (just installed and forget).

BTW, maybe its good idea to include mentioned rover.sys in dosbox package, in a way that it's installed automatically?. I see no much reason, for leaving it for manual install, especially, that it's practically required for proper Dosbox usage.

/Estel

[off-topic]Oh no, Dark Forces was much better and more "complicated" than doom. It was much more "real" 3D - with up, down, jumping, strafe'ing etc. AFAIK it was first game to introduce such "canon" FPS elements. Not to mention, that it has real plot, which couldn't be said about doom IMO, doom was more popular only thanks to multiplayer, which Dark Forces lacked.[/off-topic]