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Everything important is using ECC and low-level parity bit protection.
in a perfect world, perhaps. but we don't live in one.
Are PDP-11 computers still in use?
The PDP-11 is definitely still in use today, thanks to its unique and strong build. It is still used to power a GE nuclear power-plant robotic application — and will do so until 2050.
Technically, due to its potency, it is still used by the US Navy in its ship radar systems and by Airbus SAS. There are also rumors that it is part of the set up in the British Atomic Weapons Establishment.
Thanks Intel for making this statement false
These have a high probability of working but it isn't perfect. And not all of them tell you which way the bit was flipped.