An initial analysis of the discovered Unix V4 tape

A long-lost 1970s Unix tape turned up at the University of Utah and got restored, and the comment section promptly turned into a history nerd bar fight. The code was folded into a public GitHub archive, with old binaries removed and missing authors marked as ken and dmr (Ken Thompson and Dennis Ritchie)—which sparked a running meme of “When in doubt, Ken did it.” Purists pounced, arguing the tape looks closer to the Fifth Edition than the Fourth because labs shipped whatever was on the active machine. Pragmatists clapped back: it’s a treasure either way and the differences are tiny (a few compiler files and a “compare” tool). One commenter posted ongoing updates, while another roasted the whole debate with the classic tech punchline about “naming things” and “off-by-one errors.” Folks got giddy over the system’s big pivot: more of the core software was rewritten in early C (a friendlier language than raw machine code), making this find a time capsule of how modern computing grew up. Meanwhile, people cackled at the sight of those brutal “rm” delete commands—“archaeology but with chainsaws”. It’s equal parts museum exhibit and Reddit flame war, and everyone’s loving the drama.