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I don't know about nuclear missiles, but on the Space Shuttle I think they had four duplicate flight computers, and the outputs of all of them would be compared

I don't know about nuclear missiles, but on the Space Shuttle I think they had four duplicate flight computers, and the outputs of all of them would be compared to look for errors. (They also had a fifth computer running entirely different software, as a failover option.)

detaro 5y ago
The Space Shuttle also had a HP-41C calculator with special software to help with manual flying in case of a general computer failure: https://airandspace.si.edu/collection-objects/calculator-hand-held-hp-41/nasm_A19890003000 https://airandspace.si.edu/collection-objects/calculator-han... I wonder how viable that was for different stages in the flight.