But the true backwards compatible think here is x86: afaik up an until uefi took on, x86-64 computers still booted into real mode, so much so that some vendors

But the true backwards compatible think here is x86: afaik up an until uefi took on, x86-64 computers still booted into real mode, so much so that some vendors shipped computers with freedos… But the music stops when the isa is completely different