$ cd /a/1
$ ls -dl 4.1c.1/a
ls: cannot access ‘4.1c.1/a’: No such file or directory
$ ls -ld 4.1c.1/sys
drwxrwxr-x 21 root root 4096 Aug 11 1992 4.1c.1/sys
$ ls -dl 4.1c.2/a
drwxrwxrwx 3 root root 2048 Feb 27 1993 4.1c.2/a

4.1c.1 has kernel source is more recent than 4.1c.2, for instance

$ head -n 1 4.1c.1/sys/sys/init_main.c
/* init_main.c 4.49 83/04/04 */
$ head -n 1 4.1c.2/a/sys/sys/init_main.c
/* init_main.c 4.47 83/03/01 */

User programs (“userland”) version are the other way around, for instance
4.1c.2 usr/bin/date.c is newer than 4.1c.1 bin/date.c

$ head -n 2 4.1c.1/bin/date.c | tail -n +2
static char *sccsid = “@(#)date.c 4.2 (Berkeley) 2/26/83”;

$ head -n 2 4.1c.2/usr/src/bin/date.c | tail -n +2
static char *sccsid = “@(#)date.c 4.3 (Berkeley) 2/28/83”;

The SCCS version control has the BBN TCP/IP.

I put a repo up with the SCCS from 4.1c.1

https://github.com/ambiamber/4.1c.1-sccs2git

My list of artifacts and my opinion about them have changed a lot since my June 11, 2023 post here. If you want to see them, you can go to the Wikipedia SunOS article and view the Talk page for that.

there was also something else going on with Lucas Film in early Unix. Not sure what that was all about.

In the past I started to collect information about JHU/UNIX at BRL

https://gist.github.com/ambiamber/386f7caa72c5e3cf4e2ce2f5ccd281ce

The CSRG-DVD has the first source code artifacts from it that I’ve seen. Of note, they had very original ideas about how to build a UNIX distro.

the DVD was far more interesting than the CD-ROM set! It helped me along with a bunch of Mach stuff as well! The 386BSD discovery was interesting as well

No, I bought the CD-ROM set some time ago. Thanks for the tip.

I uploaded my 4.1c.1 BSD disk image to the IA
https://archive.org/details/4.1c.-1.tar

I’m using this for updates:
https://retrocomputing.stackexchange.com/questions/27090/a-sunos-kernel-configuration-file-in-the-csrg-isos

Seems that only the DECnet parts are of interest to me now and I don’t know beans about DECnet.

Have you seen the CSRG DVD‘s?

Unlike the CD-ROM set, they are full of interesting discovery from the infamous lawsuit. There is all kinds of interesting stuff on there!

1. Sun Microsystems supposedly had a VAX-11/750. Monet was a VAX-11/750. Was Monet really Sun’s VAX? A VAX-11/750 is sizeable chunk of change, especially one that you would only use for a short while to bootstrap SunOS on.

2. It’s clear from the residue that BSD had Sun code. Some breadcrumbs are that SCCS like RCS operates on individual files, unlike Concurrent Version System (CVS), Subversion (SVN), git and so on which can operate on groups of files. This makes it possible to expunge files and directories. If there was a hypothetical /sys/sundev directory on a VAX at UCB it would be possible to “rm -r” it along with the SCCS version control for all the files in that directory. Code like “#if sun” and “#include ” in files that contain code that cannot be expunged will still be visible in the SCCS and backup tapes, etc. The `files.sun` file is probably due to an oversight causing it to not be removed along with other files until it was discovered later. The sun code was removed by the time of 4.2BSD release. Some traces of it still exist in SCCS and old backup tapes, but that code is effectively stubbed out due to parts that it refers to not being recovered as of yet.

3. The missing 4.1b BSD could be missing because it was full of SunOS code.