  thumb|300px|the 1977 apple ii, shown here with two disk ii floppy disk drives and a 1980s-era apple monitor ii. the apple ii featured an integrated keyboard, sound, a plastic case, and eight internal expansion slots. the apple ii series (trademarked with square brackets as "apple ][" and rendered on later models as "apple //") is a set of home computers, one of the first highly successful mass-produced microcomputer products, designed primarily by steve wozniak, manufactured by apple computer (now apple inc.) and introduced in 1977 with the original apple ii. in terms of ease of use, features and expandability the apple ii was a major technological advancement over its predecessor, the apple i, a limited-production bare circuit board computer for electronics hobbyists that pioneered many features that made the apple ii a commercial success. introduced at the west coast computer faire on april 16, 1977, the apple ii was among the first successful personal computers; it launched the apple company into a successful business (and allowed several related companies to start). throughout the years, a number of models were sold, with the most popular model remaining relatively little changed into the 1990s. while primarily an 8-bit computer, by mid-run a 16-bit model was introduced. it was first sold on june 10, 1977. by the end of production in 1993, somewhere between five and six million apple ii series computers (including about 1.25&nbsp;million apple iigs models) had been produced. the apple
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