Yufeng Gao via TUHS
tuhs at tuhs.org

Tue Feb 18 19:31:55 AEST 2025

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Hi everyone,

First-time poster here. Near the end of last year, I did some forensic analysis on the DMR tapes (https://www.tuhs.org/Archive/Applications/Dennis_Tapes) and had some fun playing around with them. Warren forwarded a few of my emails to this list at the end of last year and the beginning of this year, but it was never my intention for him to be my messenger, so I'm posting here myself now.

Here's an update on my work with the s1/s2 tapes - I've managed to get a working system out of them. The s1 tape is a UNIX INIT DECtape containing the kernel, while s2 includes most of the distribution files.

The s1 kernel is, to date, the earliest machine-readable UNIX kernel, sitting between V1 and V2. It differs from the unix-jun72 kernel in the following ways:

- It supports both V1 and V2 a.outs out of the box, whereas the unmodified unix-jun72 kernel supports only V1.
- The core size has been increased to 16 KiB (8K words), while the unmodified unix-jun72 kerne