> What I meant with unrelated is instruction sets that have been developed independently and were not meant to run on the same cpu from the beginning. Beside u

> What I meant with unrelated is instruction sets that have been developed independently and were not meant to run on the same cpu from the beginning. Beside umanwizard's comment: What do you consider as "same CPU" here? As I wrote there exist SoCs that can execute multiple instruction sets (for example some DSP at the side of an ARM core, where both instruction sets were developed independently). Do you consider this as "the same CPU" or not and what is the reason why you say "yes" or "no" here?