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In page VisiCalc:
"VisiCalc ("visible calculator")[1] is the first spreadsheet computer program for personal computers,[2] originally released for the Apple II by VisiCorp on October 17, 1979.[1][3] It is considered the killer application for the Apple II,[4] turning the microcomputer from a hobby for computer enthusiasts into a serious business tool, and then prompting IBM to introduce the IBM PC two years later.[5] More than 700,000 copies were sold in six years, and up to 1 million copies over its history.[citation needed] [6]
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