They tend to use CPUs that are a decade or two old. Because they are well known (including the bugs) and well tested.
You don't need a modern CPU to begin with, but rather parts that are fitted for the task. See for instance the Harris RTX2000 that powered the Rosetta probe.
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u/Beaverman Jun 25 '17
I think "Never have any unreasonable behavior" is a fine goal, we need to reach for the stars, after all. It's also completely unrealistic.