Lotus 1-2-3 DOS version screenshot courtesy of Wikipedia. Its flagship product is Picture Window, an electric darkroom software for serious photographers.Īrguably the best know spreadsheet application today, Microsoft Excel, made its debut for the Apple Macintosh in 1985. Sachs left Lotus in 1985 and now develops software for his own company, Digital Light & Color, founded in 1993. Then, one day, a PC appeared in the Lotus office, and the decision was made to recode Lotus 1-2-3 in assembly language for the IBM computer. Sachs has said that the source code for Lotus 1-2-3 “was a stack of paper about 8-10 inches high,” and that the compiled code was 85 kb consisting of around 16,000 instructions. Lotus 1-2-3 started out as an application written in C, which ran on an Apple II with CP/M card. In 1982, Sachs left Concentric and joined Mitch Kapor to found Lotus Development Corporation. He joined Data General in 1977 and co-founded Concentric Data Systems in 1979, where he developed a spreadsheet program inspired by VisiCalc. Sachs started programming in FORTRAN during his studies at MIT in the 1960s. We connected with the developer of Lotus 1-2-3, Jonathan Sachs, to get his take on spreadsheets and the last three decades. But since it became the killer app of the first IBM PC, it certainly ranks as one of the most important pieces of software ever. When it launched on January 26, 1983, Lotus 1-2-3 was not the first spreadsheet that title goes to VisiCalc. In the 30 years since the introduction of Lotus 1-2-3 very little seems to have happened when it comes to how spreadsheets look and work.
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