As an aside - I have found memories of Rolemaster... That time the GM rolled open ended three times in a row and that squirrel killed the knight - priceless! And those critical charts - I always loved rolling a 66 on them.
But no single GM screen would have worked with that game - maybe ICE released one, maybe they didn't (I don't remember) but it would have needed 10 or 12 panels to really work - at least if you had all the supplements... And I always thought that it was terrible that MERP died right before the LotR movies were released.
This discussion over whether or not you need a DM screen, GM screen, Keeper Screen, etc really shows how the industry has evolved over the decades. At one time keeping the players in the dark was a big part of the GM's role, then the screen was needed so you could fudge dice rolls to keep characters alive, then for charts, and now charts are more or less leaving the systems.... DFRPG has maybe two pages of charts - that's it. And iPods, netbooks, etc are replacing the screens for that...
Richard