As I recall, YEARS ago on the old TI computers, there was a game called "Tunnels Of Doom" which was a very early RPG (Early 1980s) and had TONS of modded games available. As I recall, the game package came with two adventures on disk, "Quest For the King" and "Pennies and Prizes," and you could get more versions either in the computer stores of the era, or by mail order. My favorite one of those was "Adventures in K-Mart" -- the dungeon was a K-Mart store!Putrid one-dimensional graphics, but it was an enjoyable way of spending a rainy afternoon!
