If Your Name is MUD, it's for You - August 1985
From GWiki
British Telecom turns dungeons and dragons into big business next month with the launch of its Multi User Dungeon which will allow anyone with a modem and £20 to join "the largest interactive computer game in the world". MUD can accept over 100 simultaneous players and a permanent Arch Wizard will watch out for foul play.
MUD will operate from 6.00 pm to 8.00 am and all day at weekends. Originally written by Roy Trubshaw and Richard Bartle, MUD can still be played in the early hours on the Essex University Dec computer, but the BT version claims to be bigger and better.
