https://i.imgur.com/mlWhya1.png
iD Software is continuing to improve the official Doom & Doom II Unity ports with a fresh new patch that brings the game out of the 4x3 aspect ratio and in to a full 16x9 widescreen experience. You can also play the new ports on Steam so if you own The Ultimate Doom or Doom II on Steam you will get the new versions as an automatic update.

These ports don't support mouse aim or jump as some modern source ports do but since the original Doom and Doom II didn't allow that these ports are becoming one of the best ways to play Doom and Doom II in a very authentic way.

https://slayersclub.bethesda.net/en/article/Cfuf9wL5enNxkx90hfJ21/doom-and-doom-ii-update-september-3