At one stage I suspected I was in charge of the oldest in use computer still running in the world.<p>In 2001, the Australian Navy still used the Mk152 computer. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;UNIVAC_418" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;UNIVAC_418</a> on the last remaining Charles F Adams class destroyer, HMAS BRISBANE.<p>It was a general purpose computer entirely constructed from individual transistors with magnetic core memory.  We had two of these onboard and if both were down we couldn&#x27;t fire the missile system. I had 3 sailors dedicates solely to keeping these ancient machines running.<p>We got to diagnose some pretty cool bugs, like what happens when the card corresponding the the lowest significant bit of the least use register has an intermittent fault due to a bad mechanical connection.