All I remember was that anytime I needed to run a DOS game, such as Ultima, I spent hours editing the autoexec.bat file to free up conventional memory or make some boot disk that worked if lucky. It was a pain in the ass... I prefer to upgrade hardware than figure out how to free DOS memory and type the right commands so that i can play. Games that could run in my PC sometimes would not, or would run only without sound because of lack of DOS memory.