It was the Intel 8080 not the Z80 for which the V20/V30 had an emulation mode (just looked it up). To do some nitpicking on this great example: The Intel 8086/

It was the Intel 8080 not the Z80 for which the V20/V30 had an emulation mode (just looked it up). To do some nitpicking on this great example: The Intel 8086/8088 was designed to be assembly source compatible (up to search & replace) to the Intel 8080 (source: https://en.wikipedia.org/w/index.php?title=Intel_8086&oldid=735318399#The_first_x86_design https://en.wikipedia.org/w/index.php?title=Intel_8086&oldid=...). People like legulere would thus clearly nitpick that the criterion "instruction sets that have been developed independently" is not satisfied here.