Dungeon Master on Amiga, around '88.
I had C64 before that, and though I've tried few RPGs, I just couldn't quite get into them - which is odd, since I've played D&D with friends.
Or maybe that's the very reason why I couldn't get into them at first - till this day, I find video game RPGs inferior to their pen&paper counterparts...perhaps, one day when AIs become sofisticated enough and hardware capable enough to handle them, I'll change my mind.