A Research #UNIX V2 beta from 1972 brought back to life.
This copy of Research UNIX is dated mid-1972 and sits between V1 and V2. Its kernel offers a 16 KiB (8K word) user core and is capable of executing UNIX V2 (0407) a.out formatted executables; however, none of the V2 syscalls are supported. It is the earliest surviving version of UNIX in machine-readable form.
It comes from the "s1" and "s2" tapes given to @DoctorWkt by Dennis Ritchie in 1997. The "s1" tape is a copy of the UNIX INIT DECtape containing the kernel and tools necessary for restoring the system from DECtapes, and the "s2" tape contains the rest of the system. https://github.com/TheBrokenPipe/Research-UNIX-V2-Beta
