Perhaps there is no definitive CP/M machine because CP/M was the
equivalent of an early unix/linux where it was possible to run the
code (or an easy modification thereof) on so many platforms that
it can not be locked to any one in particular. I'm not saying that
CP/M is what unix/linux are, and in fact unix existed first, but
for what it was, CP/M was a fairly open system and that was both
it's vision and it's downfall.