Apple II was introduced on April 16 1977 at the West Coast Computer Fair that it is different from major competitors, which at that time was the TRS-80 and Commodore PET because it comes with color graphics and an open operating system architecture, while the first versions used an ordinary cassette as storage devices, they were. Replaced by the introduction of a 5 1/4 inch floppy disk drive and interface, the Disk II Apple II. Has been chosen to be the desktop platform for the first format in the world, "a showcase app" of the business world with VisiCalc program-computer-based documents and make a simple flyer using VisiCalc created a business market for the Apple II, and gave home users an additional reason to buy Apple II compatibility with offices, according to Brian Bagnall at first, Apple created the sales figures exaggerated and has sales rank is Commodore and Tandy until 3 from VisiCalc has been launched, and comes with the Apple II's higher sales.
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