Re: To some MSDOS was an major leap forward.
"The Z8000 was late and a disaster compared to 68000."
It worked OK. My first Unix box was a Z8000 Onyx although what was sold was a bit tightly configured. We had to by another half meg of memory and a 40 meg disk for the database. Moved on from there to a trio of Zilog boxes.
"DOS pretty much was a clone of CP/M86, which was barely more than a translation of CP/M 80."
I thought QDOS which became MSDSOE was written because Digital Research were dragging their feet over CP/M-86.