Atlantis Commander Chris Ferguson and Pilot Doug Hurley have reloaded software into General Purpose Computer (GPC) 4 and recovered the computer. It has been added to the common set of GPCs and is operating normally, processing data. Meanwhile, Mission Control is evaluating the “dump” of data from the computer that Atlantis transmitted earlier this morning to determine what caused the Thursday evening failure. GPCs 1, 2 & 4 are in “run” and GPC 3 is in “standby.” All four of the primary computers are processing data.
Here is a NASA web page that explains GPCs:
http://www.nasa.gov/mission_pages/shuttle/flyout/flyfeature_shuttlecomputers.html
The Mission Status Briefing originally planned for 4 p.m. EDT has been moved to 10:45 a.m. with STS-135 Lead Shuttle Flight Director Kwatsi Alibaruho.