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IBM acquired Lotus Development and Microsoft Excel is the spreadsheet market leader.

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IBM acquired Lotus Development and Microsoft Excel is the spreadsheet market leader.

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Lotus Development acquired Software Arts and discontinued the VisiCalc program. A Lotus spokeperson indicated at that time that "1-2-3 and Symphony are much better products so Visicalc is no longer necessary

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Lotus Development acquired Software Arts and discontinued the VisiCalc program. A Lotus spokeperson indicated at that time that "1-2-3 and Symphony are much better products so Visicalc is no longer necessary

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In May 1979, Fylstra and his firm Personal Software began marketing "VisiCalc" with a teaser ad in Byte Magazine. The name "VisiCalc" is a compressed form of the phrase "visible calculator"

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In May 1979, Fylstra and his firm Personal Software began marketing "VisiCalc" with a teaser ad in Byte Magazine. The name "VisiCalc" is a compressed form of the phrase "visible calculator"

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Daniel Fylstra, founding Associate Editor of Byte Magazine, joined Bricklin and Frankston in developing VisiCalc.  Fylstra was "marketing-oriented" and suggested that the product would be viable if it could run on an Apple micro-computer.

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Daniel Fylstra, founding Associate Editor of Byte Magazine, joined Bricklin and Frankston in developing VisiCalc.  Fylstra was "marketing-oriented" and suggested that the product would be viable if it could run on an Apple micro-computer.

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Dan Bricklin also used the help from Bob Frankston to improe his program and then Bricklin named Frankston the "co- creator" of the electronic spreadsheet.

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Dan Bricklin also used the help from Bob Frankston to improe his program and then Bricklin named Frankston the "co- creator" of the electronic spreadsheet.

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Bricklin had programmed the first working prototype of his concept in integer basic. The program helped users input and manipulate a matrix of five columns and 20 rows.

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Bricklin had programmed the first working prototype of his concept in integer basic. The program helped users input and manipulate a matrix of five columns and 20 rows.

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Rene Pardo and Remy Landau co-invented "LANPAR" LANguage for Programming Arrays at Random

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Rene Pardo and Remy Landau co-invented "LANPAR" LANguage for Programming Arrays at Random

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Professor Richard Mattessich pioneered the development of computerized spreadsheets for use in business accounting.

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Professor Richard Mattessich pioneered the development of computerized spreadsheets for use in business accounting.

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Was and is a large sheet of paper with columns and rows that organizes data about transactions for a business person to examine.

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Was and is a large sheet of paper with columns and rows that organizes data about transactions for a business person to examine.