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Before there was Ultima Online and Everquest, or even Meridian 59, there were MUDs. Standing for “Multi User Dungeon,” MUDs were the original MMOs. Played on mainframes with text descriptions and a simple command line, with no sound, no graphics, not even a map, you typed out your movements and actions in the game and waited to see the server’s response. You connected via your dial-up modem at 300 baud, and there were perhaps 20-30 players online at any given time.
Read more of Mark Kern's Recapturing that Old MUD Feeling.