Books with title All the Weyrs of Pern, McCaffrey, 1991 Hardcover

This 1991 entry into the long running series begins with the rediscovery of the computer left by the first settlers to Pern. This computer, named AIVAS, complete with its vast store of knowledge, had managed to stay operational in the intervening 2,500 plus years since the settlers had been forced to flee the original settlement. In that time the settlers had developed a new society and found methods to deal with the menacing Thread that periodically attacked their world but had lost many of the technologies that their ancestors had brought with them from Earth. Now that AIVAS was available to them the people of Pern would have the opportunity to regain this knowledge, but at what cost to their society? (Amazon customer)