The first DOOM doesn't have the doubel barreled shotgun.
Playing DOOM on the computer gave you a lot of add-ons. I had Doom98 and found a game engine for the DOOM wads called DOOMSDAY engine, it made the whole game updated. The monsters could look 3D, you could aim correctly, your weapons and items could look 3D, and the whole enviroment got a huge upgrade, it was so beautiful I could cry.
Playing DOOM on the computer gave you a lot of add-ons. I had Doom98 and found a game engine for the DOOM wads called DOOMSDAY engine, it made the whole game updated. The monsters could look 3D, you could aim correctly, your weapons and items could look 3D, and the whole enviroment got a huge upgrade, it was so beautiful I could cry.