Wikipedia has a pretty extensive article on this famous letter: http://en.wikipedia.org/wiki/Open_Letter_to_Hobbyists
> In early 1976 ads for its Apple I computer, Apple Inc made the claims that "our philosophy is to provide software for our machines free or at minimal cost"[23] and "yes folks, Apple BASIC is Free"[24]
[1] http://www.joelonsoftware.com/articles/StrategyLetterV.html