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Actually, IBM had the first real PNP. The Micro Channel bus was true PNP on the hardware level! It didn't rely on OS drivers to configure. And was much faster than the classic AT bus.
But IBM tried to be too proprietary about it. They felt they lost the PC market to clones and didn't want to loose the Micro Channel too. But no one would pay the huge fees just to sign the non-disclosure forms so the idea, good as it was, died.
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