14 Sep
1997
14 Sep
'97
3:58 a.m.
<Most RL02 are pretty good. Usually they don't have any bad spots in my
<experience.
They were low in defects<frequently none> but there was remaping so platters
with bad blocks were invisible to the system mangler/user. I just tossed a
pack that had developed more bad blocks then could be managed.
Allison
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From Johnny Billquist <bqt(a)minsk.docs.uu.se> Sun
Sep 14 08:49:54 1997
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From: Johnny Billquist <bqt(a)minsk.docs.uu.se>
Date: Sun, 14 Sep 97 1:49:54 +0300 (MET DST)
Reply-To: bqt(a)minsk.docs.uu.se
To: allisonp(a)world.std.com (Allison J Parent)
Cc: pups(a)minnie.cs.adfa.oz.au
Subject: Re: UNIX for PDP-11: moving on to media
In-Reply-To: Your message of Sat, 13 Sep 1997 17:58:38 -0400
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<Most RL02 are pretty good. Usually they don't have any bad spots in my
<experience.
They were low in defects<frequently none> but there was remaping so platters
with bad blocks were invisible to the system mangler/user. I just tossed a
pack that had developed more bad blocks then could be managed.
No exacly invisible... The operating system had to be aware of the bad spots,
and invent some scheme or other to hide the spots from the user.
OS/8's solution is rather hairy. I know, since I didn't have a
"formatter"
program, so I needed to write one, given the source of the device driver...
Bad spots on MSCP disks on the other hand are totally invisible.
Johnny
Johnny Billquist || "I'm on a bus
CS student at Uppsala University || on a psychedelic trip
email: bqt(a)minsk.docs.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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From Johnny Billquist <bqt(a)minsk.docs.uu.se> Sun
Sep 14 08:55:55 1997
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From: Johnny Billquist <bqt(a)minsk.docs.uu.se>
Date: Sun, 14 Sep 97 1:55:55 +0300 (MET DST)
Reply-To: bqt(a)minsk.docs.uu.se
To: allisonp(a)world.std.com (Allison J Parent)
Cc: pups(a)minnie.cs.adfa.oz.au
Subject: Re: Bootstrap Idea
In-Reply-To: Your message of Sat, 13 Sep 1997 17:58:31 -0400
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<Unix was just a small hack inspired by Multics, and
looking at contemporar
<operating systems, I'd say there were some that were way ahead of Unix (an
<still are...)
yes, but as hacks go it was more public in code than other OSs of value in
that time frame. I'm not saying was the best. Also I've never used
multics. My experience in chronological order is OS/8, TOPS-10, CP/M-80,
NS*dos<z80>, RT-11, RSTS, RSX-11, VMS, Ultrix. So those are what I have to
look at when thinking in terms of 1970s OSs like Unix of the time.
Oh, certainly, the source was available. I would say that that, along
with the fact that you got it for free, were the only two reasons for
its rise to fame.
If you compare Unix with the systems you mention above, most of the
DEC stuff have had some stuff since the '70s that Unix only got in the
90s... (Shared libraries and microkernels for instance.)
<Operating systems in the last twenty years have
really retro-developed. :-
If you mean what I think the answer is not here. If anything my view is
more of when will dos/winders perform as well as some of those OSs of the
time. Then again, I had VMS4.6 running decwindows and four users on a
microvaxII with 9meg and 3 RD53s in 1989.
What I meant was that development have gone backwards with regards to
operating systems in the last twenty years. :-)
Who knows how many things Microsoft has reinvented in the last few
years, and Unix hasn't been much better either...
(Okay, so this is the list for Unixes on the PDP-11, so I'll defend
that particualr Unix. It's still clean and mean, which was the purpose
of the design, and not the overbloated monster called Unix
nowadays...)
Johnny
Johnny Billquist || "I'm on a bus
CS student at Uppsala University || on a psychedelic trip
email: bqt(a)minsk.docs.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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