Implementing VisiCalc

David Leppik writes "The author of VisiCalc, the first spreadsheet program, has an article about how it was designed. VisiCalc is why businesses started to take the Apple ][ (and personal computers in general) seriously. It also changed accounting forecasts forever, which triggered the investment boom that brought us the "greed is good" era. Oh, and you can still download VisiCalc in case you run DOS or Windows and have 27,520 bytes to spare."