This is a great idea, seriously. AD&D 1ed is over 25 years old so I'm sure they were a lil wet behind the ears with this d20 random method. You have added a fix and I'm positive that you could also keep working it to make it less random and more unified by working in sections. I could never do that since I couldn't program a Tivo. Please keep working on it, it has some real possibilities for random generation for a quickie map...if for nothing else but to inspire a base map to develop further in PS, GIMP, etc.