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university utah unix recovery old school preservation

Lost Unix v4 source code from 1973 recovered from decades-old magnetic tape

Through the looking glass: A half-century-old magnetic tape containing the only known copy of Unix v4 has been found and recovered by the University of Utah's School of Computing. The nine-track 3M magnetic tape dates back to 1973 and contains roughly 40 megabytes of data – the earliest surviving Unix release in which both the kernel and core utilities were written in C.