16 Apr
2001
16 Apr
'01
3:34 p.m.
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@Informatik.BA-Stuttgart.DE]
Sent: Saturday, April 14, 2001 11:49 AM
To: helbig(a)Informatik.BA-Stuttgart.DE; kwellsch(a)tampabay.rr.com
Cc: pups(a)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