That Bell Labs ‘Unix’ Tape from 1974: From a Closet to Computing History (ksltv.com)

Posted by EditorDavid on Sunday January 11, 2026 @10:34AM from the old-OS dept.

Remember that re-discovered computer tape with one of the earliest versions of Unix from the early 1970s? This week several local news outlets in Utah reported on the find, with KSL creating a video report with shots of the tape arriving at Silicon Valley’s Computer History Museum, the closet where it was found, and even its handwritten label.

The Salt Lake Tribune reports that the closet where it was found also contained "old cords from unknown sources and mountains of papers that had been dumped from a former professor’s file cabinet, including old drawings from his kids and saved plane ticket stubs." (Their report also includes a photo of the University of Utah team that found the tape — the University’s Flux Research Group).

Professor Robert Ricci believes only 20 copies were ever produced of the version of Unix on that tape: *At the time, in the 1970s, Ricci estimates there would have been maybe two or three of those computers — called a PDP-11, or programmed data processor — in Utah that could have run UNIX V4, including the one at the U. Having that technology is part of why he believes the U. got a copy of the rare software. The other part was the distinguished computing faculty at the school.

The new UNIX operating system would’ve been announced at conferences in the early 1970s, and a U. professor at the time named Martin Newell frequently attended those because of his own recognized work in the field, Ricci said. In another box, stuffed in under manila envelopes, [researcher Aleks] Maricq found a 1974 letter written to Newell from Ken Thompson at Bell Labs that said as soon as "a new batch comes from the printers, I will send you the system." Ricci and Maricq are unsure if the software was ever used. They reached out to Newell, who is now 72 and retired, as well as some of his former students. None of them recalled actually running it through the PDP-11...

The late Jay Lepreau also worked at the U.’s computing department and created the Flux Research Group that Ricci, Maricq and [engineering research associate Jon] Duerig are now part of. Lepreau overlapped just barely with Newell’s tenure. In 1978, Lepreau and a team at the U. worked with a group at the University of California, Berkeley. Together, they built their own clone of the UNIX operating system. They called it BSD, or Berkeley Standard Deviation. Steve Jobs, the former CEO of Apple, worked with BSD, too, and it influenced his work.

Ultimately, it was Lepreau who saved the 9-track tape with the UNIX system on it in his U. office. And he’s why the university still has it today. "He seems to have found it and decided it was worth keeping," Ricci said...

The U. will also get the tape back from the museum. Maricq said it will likely be displayed in the university’s new engineering building that’s set to open in January 2027. That’s why, the research associate said, he was cleaning out the storage room to begin with — to try to prepare for the move. He was mostly just excited to see the floor again. "I thought we’d find some old stuff, but I didn’t think it’d be anything like this," he said. And Maricq still has boxes to go through, including more believed to be from Lepreau’s office.

Local news station KMYU captured the thoughts of some of the University researchers who found the tape: * "When you see the very first beginnings of something, and you go from seed to sapling, that’s what we saw here," [engineering research associate Jon] Duerig said. "We see this thing in the moment of flux. We see the signs of all the things changing — of all the things developing that we now see today."* Duerig also gave this comment to local news station KSL. "The coolest thing is that anybody, anywhere in the world can now access this, right? People can go on the internet archive and download the raw tape file and simulate running it," Duerig said. "People have posted browsable directory trees of the whole thing." *One of the museum’s directors said the tape’s recovery marked a big day for the museum "One of the things that was pretty exciting to us is that just that there is this huge community of people around the world who were excited to jump on the opportunity to look at this piece of history," Ricci said. "And it was really cool that we were able to share that."

Duerig said while there weren’t many comments or footnotes from the programmers of that time, they did discovery more unexpected content having to do with Bell Labs on the tape. "There were survey results of them actually asking survey questions of their employees at these operator centers," he said.

Thanks to long-time Slashdot reader walterbyrd for sharing the news.