It wrote directly to the video memory rather than resorting to using slow DOS and BIOS output functions like other spreadsheets at the time. Its design was very similar to that of VisiCalc, including the A1 notation for cells and the slash-menu structure, but made some improvements, particularly in performance since it was cleanly programmed in x86 assembly language and mostly bug-free. ![]() Lotus itself was founded by Mitchell Kapor, who was a friend of the developers of VisiCalc, the number-one spreadsheet program at the time. Lotus 1-2-3 was originally developed by Jonathan Sachs, who had already developed two spreadsheet applications while employed at Concentric Data Systems.
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