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- It was a while before systems regularly bumped against the 640 KiB limit of address space usable for software RAM. The IBM PC maxed out at 640 KiB; it wasn't until the IBM PC/AT you could add more, and even then only because it used the 80286 instead.user– user2017-08-10 14:12:44 +00:00Commented Aug 10, 2017 at 14:12
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