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Was the bit present int the source, i.e., was the parity stored together with the data? Then this would be a case where reading uninitialized memory could trap. (If, by contrast, the extra bit is only present during transmission and computed on-the-fly, it would simply be computed correctly for the arbitrary uninitialized data.)
– Peter - Reinstate Monica
Commented Jul 8, 2023 at 10:42
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@Peter-ReinstateMonica Parity was of course also stored in core memory to validate content.
– Raffzahn
Commented Jul 8, 2023 at 19:41

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