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Why not a Rad Hard 8086 https://www.renesas.com/in/en/products/space-harsh-environme... or maybe a Rad Hard RCA CPD1802 https://www.renesas.com/in/en/products/space-harsh-environme... ? Those might survive a hydrogen bomb if not too close.

I've thought about this a little, and I think rebooting vacuum tube technology from scratch is possible more easily. Not trivial, but possible. Once you get reliable triodes, you're on your way.

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