>A piece of trivia the Voyager space craft used the RCA 1802.
>It was quite radiation resistant because of the rather
>large track sizes on the silicon.

The tracks were not on silicon. These were SOS (Silicon on Sapphire) devices 
which are inherently radiation resistant as there is no bulk silicon 
underneath the silicon tracks, so you don't get the problem of ions being 
trapped in the bulk silicon and causing triac type problems shorting power 
supplies through the substrate. 

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