[pups] Ken_Welsch_v6 and Dennis_v6

[Wolfgang Helbig]

> I always wondered why when booting the image it did not print the
> notice so often displayed with V6.  I've not looked at the physical
> tape this image was pulled from in many years, but I cannot imagine
> the fine folks at the University of Waterloo (where I worked for
> many years) would have changed anything.  So I would gather from
> your detective work that based on dates, this tape just predates
> that provided by Dennis Richie by such a short time?  I do know

No, the other way round: The tape you provided is from October 10th
and the disk image provided by Dennis is from July 18th. The
"RESTRICED RIGHT"- remark was put into the kernel on October 10th.
It is on the tape that you provided, it is not on the disk image
from Dennis.  But the source code from the Lions book shows this
remark as well.

I don't know who changed main.c on October 10th 1975 (I lived in Israel
at that time)

You see the remark only if you set the switch register on the PDP-11
to a nonzero value befor booting. I installed V6 from the tape
following the setup instructions. With the Supnik simulator, enter
	sim > d sr 1
	sim > boot rk0
	@rkunix

And it will print your rights!

Wolfgang