"Scott Dorsey" wrote in message
...

Intel made
the 8080, but then Zilog made a compatible microprocessor, the Z-80,
that was totally different inside.

ISTR that the Z80 was designed by an Intel team, but when Intel opted
instead for the 8085 as the next step after the 8080, that the Z80 team
decamped and set up Zilog.

(Info gained when on an Intel training course in Swindon in 1981)