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In Pictures: Skylab, NASA's first space station ma...
Two IBM computers in the Skylab controlled the orientation of the laboratory throughout the mission. The onboard computers, which were arranged redundantly, were models of IBM's System/4Pi, a computer designed for the special weight and environmental requirements of aerospace applications. Each of the IBM computers aboard Skylab weighed 100 pounds and measured 19 by 7.3 by 31.8 inches. They were capable of handling more than 100 signals to Skylab attitude control equipment, IBM says.
In Pictures: Skylab, NASA's first space station marks 40 years