Great story!<p>I worked at a large aerospace manufacturer who had their most important production systems (just for a single factory) running on an ancient VAX.<p>It was written in the 60&#x27;s and the original author&#x27;s son, who was the sole person on the planet who knew anything detailed about it - he was the architect, the dev, the BA, the sysadmin and so on - was due to retire after 35 years with the company.<p>The DR plan was similar to this - they had found a model of the same computer in a museum somewhere that still worked and they had dibs on it.<p>In the end they shut down the factory, one of the major factors in that decision was this system. Just too hard to replace it