You mean the original Doom WADs, or something else?
You can get the original Doom WADs from id's website
, although they're kind of expensive. You can also get them from Steam
, with somewhat more reasonable prices. In the case of the Steam version, you get the original DOS Doom files, and a preconfigured copy of DosBox to run them. I believe that id's downloadable versions are just the original DOS Doom files.
From either of those, you can just copy the WAD files out, and use them in this.
You can also use the shareware version of Doom 1. You can get the WAD file for it from Doomworld
. That gives you the first episode of Doom 1, but you almost certainly wouldn't be able to play any other WADs with this.HacX
, which was a commercial Doom-based game, later released for free on the 'net. I can't speak for this port, but this worked pretty well with nxDoom back in the day.
There's also Chex Quest, which was a promotional game based on Doom 1. Both Chex Quest and the add-on (Chex Quest 2) should be available online somewhere, and they both work on any Doom engine, without an original Doom WAD file.
In order to play any other Doom WAD file, you need a copy of the original game data. The full versions, not the shareware version.
However, you could also use FreeDoom
. It provides a complete set of replacement assets, but it's levels are only compatible with Doom engines that support Boom extensions (in other words, not this one). That means you won't be able to play FreeDoom's levels, but you can use it as a base to load and run almost any Doom 1 or Doom 2 add-on, including stand-alone maps, map packs, or total conversions. Anything using graphics or sounds from Doom will use the FreeDoom ones instead - it'll work, but they won't be quite the same.
Some of the more popular TCs for Doom:http://www.chocolate-doom.org/wiki/inde ... tegory:TCs
Otherwise, there are tons more Doom modifications out there.