 Originally the game began with just Fort Weyr and a few Holds, however expansion shortly followed, filling out the game to five Weyrs, with Benden in place of Telgar.In 1993, McCaffrey reached an agreement with the community operators of "PernMUSH" that set out terms for copyright notification and for the degree of creative license allowed to players in the Pern setting.In 1997, a disagreement arose over the scope of the setting.