Analysis of Rediscovered 1973 Fourth Edition Research Unix Source Code
By
DSpinellis
Pure flour-power. Hearty enough to carry you through lunch.
Summary
A researcher has successfully incorporated the source code from a recently discovered 1970s Fourth Edition Research Unix magnetic tape into the Unix History Repository on GitHub. The tape was found at the University of Utah in July 2025 and represents a significant historical find since previously only the Fourth Edition's manual was thought to have survived. The article details the analysis of the code composition and highlights that this edition, released in November 1973 from AT&T Bell Laboratories, introduced important developments including the rewriting of key system components.
Key quotes
· 4 pulledThis is a significant find, because up to now only the Fourth Edition's manual was thought to have survived.
The Fourth Research Edition Unix came out of the famous AT&T Bell Laboratories in November 1973.
Over the past few days I incorporated the tape's source code into the Unix History Repository hosted on GitHub and studied the code's composition.
A significant development it introduced was the rewriting of key system components.
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