Hidden in storage, a University of Utah research associate happened upon the only known copy of this ‘revolutionary’ software

It took careful work to recover the UNIX V4 operating system from the 9-track magnetic tape. The software is foundational for ...
Hackaday

Only Known Copy Of UNIX V4 Recovered From Tape

UNIX version 4 is quite special on account of being the first UNIX to be written in C instead of PDP-11 ASM, but it was also considered to have been lost to the ravages of time. Joyfully, we can ...