MISSION CONTROL CENTER STS-71 Status Report #6 Friday, June 30, 1995, 6:30 a.m. CDT The eight astronauts on board Atlantis received a wakeup call from Mission Control at 1:32 a.m. CDT today, ready to begin the first full day of joint operations on board the linked shuttle and Russian Mir Space Station. The musical wake-up call was "Wildest Dreams" by the Moody Blues. About one hour before receiving that formal wakeup call, Commander Hoot Gibson awoke when General Purpose Computer 4 experienced a brief "hiccup"causing a warning alarm to sound on board. Spacecraft Communicator Dan Bursch then called up to Atlantis advising Gibson to turn off GPC 4 and load the system manager software on GPC 3. There are five general purpose computers on board Atlantis, with one designated as the system manager to monitor various orbiter systems. GPC 3 is now designated as the system manager. Flight controllers will look at the possible causes of the GPC 4 alarm once the crew officially begins its fourth flight day on orbit. Atlantis is now home to the five STS-71 crew members -- Gibson, Pilot Charlie Precourt, Payload Commander Ellen Baker, and Mission Specialists Greg Harbaugh and Bonnie Dunbar -- and the Mir 18 crew members -- Commander Vladimir Dezhurov, Engineer Gennady Strekalov, and Cosmonaut Researcher Norm Thagard. For the next four days, in cooperation with their counterparts on board Mir -- Commander Anatoly Solovyev and Engineer Nikolai Budarin -- the astronauts will support 15 separate biomedical investigations into how the human body functions in a microgravity environment. Those investigations will be conducted in the Spacelab module tucked in the aft section of Atlantis' payload bay. Seven different disciplines are represented including cardiovascular and pulmonary functions in weightlessnessness, human metabolism, neuroscience, hygiene, sanitation and radiation, and behavioral performance and biology. The studies begun during the Mir 18/STS-71 mission will continue for several years as part of the continuing Shuttle-Mir Science Program. In addition to supporting the medical and scientific investigations, crew members will transfer equipment, hardware and experiment specimens from the Mir module to Atlantis for return to Earth. Earlier this morning, the two crews met in the Spacelab for a ceremonial gift exchange commemorating this flight. During the ceremony the crew members joined a halved pewter medallion bearing the impression of a docked shuttle and Mir, and a scale model of Atlantis and Mir. Circling the Earth at an altitude of 218 nautical miles every 92 minutes, Atlantis and Mir have become the largest single spacecraft ever in orbit.