There are certain RPGs (such as Justice, Inc., Bushido, James Bond 007, Space 1889…) that I remember from back in the day with such wistful fondness that I am occasionally tempted to haul them off the shelves and play an adventure for nostalgia. The usual result is that I quickly rediscover the quirks and failings that drove me to abandon them back then, and if the adventure or campaign is to continue I replace the nostalgic dinosaur with a modern game designed in 1986. But there are a very scant few that I think I would be content to play at length, even after all these years, without drastic house rules. I’d play RuneQuest III (1984). I think I might play DragonQuest 2nd edition (1982).
What’s the oldest RPG you would be happy to play without extensive patching?