For more context, the vacuum tube computers were only around in 1995 because a massive decade-long upgrade project failed in 1994. http://www.bloomberg.com/bw/

For more context, the vacuum tube computers were only around in 1995 because a massive decade-long upgrade project failed in 1994. http://www.bloomberg.com/bw/stories/1993-04-25/flying-in-place-the-faas-air-control-fiasco http://www.bloomberg.com/bw/stories/1993-04-25/flying-in-pla...