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I know this is software focused, but as much of the work done in DOS 2.0 was to support the introduction of hard disks, it would be worth mentioning what the hardware was in the PC/XT:<p><a href="https://en.wikipedia.org/wiki/ST-506/ST-412" rel="nofollow">https://en.wikipedia.org/wiki/ST-506/ST-412</a><p><a href="https://www.google.com/search?client=firefox-b-d&q=ST-212+hard+drive" rel="nofollow">https://www.google.com/search?client=firefox-b-d&q=ST-212+ha...</a>