If you can count it as an RPG, I'd say D&D: Treasure of Tarmin for the Intellivision. I played that game so much I probably knew all the ins and outs of it. Sadly I haven't played it in awhile and I need to start again.
The second RPG I played if I remember correctly was the Dragon Warrior. My cousin had a copy and I played it for a bit at his house. Later on he sold all of his NES games and I got his copy along with the map and guide.
The second RPG I played if I remember correctly was the Dragon Warrior. My cousin had a copy and I played it for a bit at his house. Later on he sold all of his NES games and I got his copy along with the map and guide.