Games were still the most popular choice, of course, but educational software had a large market, too. And business users were beginning to find office-oriented products such as the WordStar word-processing package, the dBase database program, and the first of the must-have killer apps, VisiCalc, an electronic-spreadsheet program for the Apple II that automated the tedious chores of bookkeeping and financial analysis. Businesspeople were soon buying Apple IIs just so they could run the program; Apple later estimated that VisiCalc was responsible for the sale of some twenty-five thousand units
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