What's the fixation with playing the original versions of Doom, Doom 2, and Heretic, when there are source ports out there that look and run sooo much better?
JDoom/JHeretic/Jhexen: OpenGL & D3D support, DirectSound support, music through MIDI mapper (or plays MP3s)
http://www.doomsdayhq.com
Legacy (Doom/Heretic): OpenGL, GLide, and software rendering support, Directsound, MIDI music
http://legacy.newdoom.com
VaVoom (Doom/Hexen/Heretic/Strife [sort of]): OpenGL & D3D, Directsound, MIDI music, and large amounts of renderer code "borrowed" from GPL Quake
http://www.vavoom-engine.com
ZDoom (Doom): Software rendering only, but very fast. New map-design features. Will soon have a proper OpenGL renderer
http://zdoom.notgod.com
I think you get the idea. All of these ports are better-looking and sounding than the DOS versions, and all of them run much better on modern hardware and operating systems. JDoom in particular is very good, because unlike regular Doom, it can run faster than 35 fps, has dynamic lighting and all kinds of other weird features, and still captures the same "feel" as regular Doom.