If Intel only had retroactively updated the 8088/8086 line with the “8086-2” ISA (there are 8086-1 and 8086-2 chips, but they’re not related to the instructions set). The Z80 series had an ...

The 8086 instruction set is not the only instruction set that modern x86 supports. There are dozens of instruction sets from the well-known floating-point, SSE, ...