Home›Articles›How an Apple III booted SOS and shared a disk with ProDOSArticleHow an Apple III booted SOS and shared a disk with ProDOSArticlesConnectionsSourcesComments (0)Reader Challenges (0)ConnectionsArticle OnApple SOS, Systems Well-attested SourcesWikipedia: Apple SOSTechnical details, Boot sequenceQuote, Technical details, Boot sequenceApple ProDOS uses the same file system as SOS. On a disk formatted by ProDOS, the ProDOS loader and SOS loader are written to blocks zero and one, respectively.View the SourceAtlas Article Vocabularytier 1AtlasComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.