I worked with a couple of Hungarians who had previously been working on Russian USSR ICBM launchers. Their targeting computers were based on relays as they aren't effected by EMP.
Years ago the was a TV documentary about how behind the technology curve the USSR was. They cited the case of a MiG something or other that defected/got forced down and how it was jammed full of teeny thermionic valves. Hah, they said, those pesky Soviets and their old technology.
Fast forward a few months and there was another documentary about how the EMP from a nuclear strike will banjax the whole of Western technology. They then roll out the same story about the defecting MiG, but this time change the ending to show how dastardly clever those pesky Soviets were with their clever EMP-defying technology.