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UNIX V4 tape successfully recovered: First ever version of UNIX written in C is running again

Crucial early evolutionary step found, imaged, and ... amazingly ... works Computer History Museum software curator Al Kossow ...
Hackaday

UNIX Archaeology Turns Up 1972 “V2 Beta”

In 1997 a set of DEC tapes were provided by Dennis Ritchie, as historical artifacts for those interested in the gestation of the UNIX operating system. The resulting archive files have recently been ...