This is your space shuttle's brain

It’s true: The brain of NASA’s primary vehicle has the computational power of an IBM 5150, that ’80s icon that goes for $20 at yard sales. According to NASA and IBM, the shuttle’s General Purpose Computer (GPC)—which controls, among other things, the entire launch sequence—is an upgrade of the 500-kilobyte computer the shuttle flew with until 1991.

http://www.popsci.com/military-aviation-amp-space/article/2009-02/does-space-shuttle’s-computer-real