It could mean either. Rad-hard parts are used in satellites. I am not familiar with the current crop of rad-hard parts. I did work as a CPU logic desiger at Am

It could mean either. Rad-hard parts are used in satellites. I am not familiar with the current crop of rad-hard parts. I did work as a CPU logic desiger at Amdahl. We had full parity through-checking, so an ALU intermittent logic error would raise a parity exception. Certainly IBM would have had the same, it was standard SOTA reliability logic for the era of mainframes when I was a designer.