Strange as it may seem, Lotus 1-2-3 was actually partly responsible for a big DOS shakeup. That shakeup involved expanding the memory we had available, and thereby allowing for a raft of further software which could take advantage of it. This video charts the story of Lotus 123, and how a revision called on an urgent need to exceed the DOS conventional memory limits and introduce a method of paging memory from an additional card, known as an Above Card, holding EMS, Expanded or LIM Memory.

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