I have to agree with CR, times when computers couldn't handle jj2 at resolution bigger than 320x240 are gone. And you can't say that Damn is supposed to be played at 320x240 when it's also playable at 640x480. Jazz isn't more visibile at that resolution, you cant see a thing. Also, more visibility, you cant count pixels without any problem, everything is much more fun when you can see more things.

That reminds me of bigjazz.exe and screen with resolution around 1600x1200.