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There was the V20/V30. It was a drop-in replacement for the 8088 that could also execute 8080 (or Z80---it's been awhile since I used one) code (it was also fa
by spc476 10y ago
There was the V20/V30. It was a drop-in replacement for the 8088 that could also execute 8080 (or Z80---it's been awhile since I used one) code (it was also faster at executing 8088 code, which is why a lot of people used it). While the 8088 is descended from the 8080, it's not binary compatible (completely different opcodes) and probably fits your criteria.
- wolfgke 10y agoIt 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.