Microsoft and Apple did, at the very least. Apple started out with a bunch of people trying to buy more of Steve Wozniak's hand built computers than he could keep up with, and Bill Gates sold IBM an operating system well before he had an actual product to show them.
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Microsoft and Apple did, at the very least. Apple started out with a bunch of people trying to buy more of Steve Wozniak's hand built computers than he could keep up with, and Bill Gates sold IBM an operating system well before he had an actual product to show them.
Bill Gates and Microsoft started selling BASIC interpreters for the Altair computer. The IBM and DOS thing was several years later.