[pups] Ken_Welsch_v6 and Dennis_v6

[Ian King]

All, 

Yes, I saw the "rights" declaration (with a non-zero switch register) on
a real machine (PDP-11/34a with programmer's panel), when I booted Ken's
v6 distribution in single-user mode (there is a specific value you enter
into the register, 173030, as documented in bproc.8; does anyone know
why this value was used?).  

I'm not sure why, but I was never able to get Dennis' distribution to
boot in the emulator; as a result, I didn't take the time to copy it
over to an RK05 (using Warren's excellent tools) to boot on the 11/34.  

-- Ian 

-----Original Message-----
From: Wolfgang Helbig [mailto:helbig at Informatik.BA-Stuttgart.DE] 
Sent: Saturday, April 14, 2001 11:49 AM
To: helbig at Informatik.BA-Stuttgart.DE; kwellsch at tampabay.rr.com
Cc: pups at minnie.cs.adfa.edu.au
Subject: Re: [pups] Ken_Welsch_v6 and Dennis_v6


> 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