Home›Articles›Why Unix had a System III but no System I, II or IVArticleWhy Unix had a System III but no System I, II or IVArticlesConnectionsSourcesComments (0)Reader Challenges (0)ConnectionsArticle OnUNIX System III, Systems Well-attested SourcesWikipedia: UNIX System IIILead section, paragraph 3Quote, Lead section, paragraph 3its manual refers to it as UNIX Release 3.0 and there were no Unix versions called System I or System IIView 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.