Lotus 1-2-3 is a spreadsheet program from Lotus Software (now part of IBM). It was the IBM PC's first killer application; its huge popularity in the mid-1980s contributed significantly to the success of IBM PC in the corporate environment.

Beginnings

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The Lotus Development Corporation was founded by Mitchell Kapor, a friend of the developers of VisiCalc. 1-2-3 was originally written by Jonathan Sachs, who had written two spreadsheet programs previously while working at Concentric Data Systems, Inc.

1-2-3 was released on January 26, 1983, started outselling then-most-popular VisiCalc the very same year, and for a number of years it was the leading spreadsheet for the DOS operating system. Unlike Microsoft Multiplan, it stayed very close to the model of Visicalc, including the "A1" letter and number cell notation, and slash-menu structure. It was free of notable bugs, and was very fast due to being programmed entirely in assembly language and writing video directly to hardware rather than depending on DOS functions.

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