UNIX V4, the first version of UNIX with a C-written kernel, has been successfully recovered from a 1970s tape found at the University of Utah. The recovery was led by Al Kossow and involved reconstructing the data using the readtape program. Users can download the recovered files from the Internet Archive, with guides on running it through emulators like SimH. This marks a significant step in computing history, showcasing UNIX’s evolution from early assembly-coded versions to a more complex system.
https://www.theregister.com/2025/12/23/unix_v4_tape_successfully_recovered/