Oh I sure do. I think I lost my college years between 1991 and 1993 in a MUD out of Sweden called, StickMUD. I would either play in my house on my solid 1200 baud modem or go to the campus and play from a Library computer.
So many people were MUD-ing on campus that the school eventually banned any multiplayer games from being played on school systems. They then attempted to ban students from playing MUDs all together due to the their perceived notion it was disrupting our studies.
All of this and it was strictly a text based MMORPG! Imagine reading your way through EQ now?