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I didn't have time to say this in the talk, but I would consider protected memory to be one of the major improvements in software technology that has actually happened (though it's also a hardware technology, so it's a bit mixed). Protected memory was available in a widespread
way on workstation-class computers in the 1980s, but didn't make it to home computers until sometime like Windows 2000 / Windows XP.
in my view systems like Amiga failing and PC/Win taking over the market set us back by a decade no less
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