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Re:Ask HN: What exactly do you mean by implementation? by PaulHoule on Sunday September 24, 2017 @09:54AM (#15324702)
I think there is something conceptual and then you make it real by implementing it.

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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