I just bought Doom Classic Complete on steam (I am running Windows 8):


Below are the files for Ultimate Doom after the steam download:

C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base\dosbox.exe C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base\SDL.dll C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base\SDL_net.dll C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base\DOOM.EXE

I am then trying to start Ultimate doom:

enter image description here

But get this:

enter image description here

I have then googled this issues and followed this guide:

but it does not help.

I also looked at (more or less the same as above):


He then describes the following:

This next step happens fast. Once the game is launched, multiple dosbox windows will appear on the screen very quickly, and one of them will takover fullscreen.

As SOON as you see the window take over fullscreen (there will be a large blue box at the top of the screen), press the start key on your keyboard. If you time this too late, you'll have to restart the process of running the game.

Now this part:

press the start key on your keyboard

Never heard of of a start key on a PC keyboard what is he talking about? Further I don't get the blue DOSBox screen just the error above.

I cannot start Doom II either, its actually get to the start/splash screen:

enter image description here

That I can fullscreen with Alt+Enter. But nothing happens.

I tried to do this (Only on Doom II):


But the games still does not work.

Anyone had success with this or did I just throw money out the window?


2 Answers 2


From the OP's edit on their question:

The trick was to set:


It now works.


While I'm not sure how you can get it running through steam, you can just use the files from it to run the game on DOSBox yourself.

First of all, install DOSBox.

Then, launch it and type "mount c (game folder here)". (if it gives an error, try moving the game files to a simpler directory, like "c:\doom\")

Then type "c:", and type "doom".

Screencap about how to run

(Note: About the Arrow in the picture, I mistyped it)

After running the "doom" command, the game should work:

game screenshot

  • Also try copying the files from newly installed dosbox to the game directory (You stated that it is there: C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base\dosbox.exe), I'm not including this in my answer as I don't have the game on steam (I have it on disk), so I can't try.
    – ave
    Commented Feb 21, 2016 at 11:55
  • Also sidenote: I'm running Windows 10 Pro v1511 x64.
    – ave
    Commented Feb 21, 2016 at 12:07

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