There's a lot of early and high-res (640x480) screenshots here when Romero did a blog post about the 20th anniversary of Quake about 2 months ago : http://rome.

There's a lot of early and high-res (640x480) screenshots here when Romero did a blog post about the 20th anniversary of Quake about 2 months ago : http://rome.ro/news/2016/6/22/happy-20th-birthday-quake http://rome.ro/news/2016/6/22/happy-20th-birthday-quake (HN: https://news.ycombinator.com/item?id=11959765 https://news.ycombinator.com/item?id=11959765)