ADoom works perfectly with any resolution, even 1024X768 or higher! You have to specify a screen resolution in the tool types and then when you pick the higher res screenmode it will be full screen! If you have it set to the default 320X200 (with no tool type set) and you simply pick 640X400 it will not work! You have to specify I believe the command is HEIGHT=400 and WIDTH=640 for it to work. On my 060/66MHz based setup with CyberGraphx 64 I can get 640X480 running very well (around ~12 fps)
