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A comment on Ask HN: What exactly do you mean by implementation?.
An "oldie but goodie" example is
https://en.wikipedia.org/wiki/IBM_System/360
These machines had one instruction set architecture, but different hardware implementations of it so you could run the same software on machines with different memory size, speed and cost.
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An "oldie but goodie" example is
https://en.wikipedia.org/wiki/IBM_System/360
These machines had one instruction set architecture, but different hardware implementations of it so you could run the same software on machines with different memory size, speed and cost.