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[b]Backup computer not responding to commands[/b] The Mission Control team at NASA's Johnson Space Center in Houston confirmed Friday night (April 11) that a backup computer on the exterior of the International Space Station called a Multiplexer-Demultiplexer (MDM) is not responding to commands. The station's MDM computers control some systems associated with robotics aboard the space station. The primary MDM operating aboard the space station is functioning normally and there is no immediate impact to space station operations. The computer outage does not pose a risk to the six crew members aboard the space station. ISS teams are assessing next steps to attempt to bring the computer back online or replace it. Replacing the backup MDM, if needed, would require a spacewalk.
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