Lotus 1-2-3 on the PC w/DOS

stonetools.ghost.io/lotus123-d

VisiCalc started it, but 1-2-3 finished it. "It" being the discussion of what a spreadsheet can be, and also VisiCalc itself.

<- this is fun, but it is basically "a millennial discovers what you could do with 1-2-3 before they were born, and is blown away."

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