At one of my jobs, we used CPU (pre-Intel design), made by a defense manufacturer, in our control systems. When mfr. decided to discontinue CPU manufacturing, w

At one of my jobs, we used CPU (pre-Intel design), made by a defense manufacturer, in our control systems. When mfr. decided to discontinue CPU manufacturing, we bought all the inventory from last few production runs. AFAIK, we are still running those control systems using the same CPUs and hardware for now 30+ years.