Sure CP/M ! 8080/8085 Assembly and Zenith Z100 platforms. I also worked with the NEC V20
chips for the 8088/8086. Not only were they twice the speed of the Intel chips but given
the correct Register Flag it would emulate the 8080/8085/Z80 CPU.
I even worked on a CP/M Lifeboat 2.2 weather computer than had 9 Z80 CPUs for processing
downloaded satellite weather information for my state's DoT.
The reality Today (to place this discussion back On Topic) is that 720KB disks just don't
cut the mustard for storage in Today's computing environment.