Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!rls!randy
From: randy@rls.UUCP (Randall L. Smith)
Newsgroups: comp.sys.dec.micro
Subject: Re: Unix (or flavor thereof) for PDP 11/23 (18 bit backplane)
Summary: correction
Message-ID: <10402@rls.UUCP>
Date: 19 Mar 90 20:45:20 GMT
References: <10394@rls.UUCP> <333@gca.UUCP>
Organization: The Internet
Lines: 60

> Summary: What if you already HAVE the 11/73?

Then you run RSX. :-)

In article <333@gca.UUCP>, beaulieu@gca.UUCP (Larry Beaulieu) writes:
>In article <10394@rls.UUCP>, randy@rls.UUCP (Randall L. Smith) writes:
>> The 73 is a better machine though. 

Yep.  I'll stand by that.  BTW, relative to a 11/23 running Unix.

> Usually, if you take advantage of it; but not always if you're doing
> 'real' real time - the cache will kill you if you're not careful.
> In those cases, you will usually get a more deterministic response (and
> save $$$) by using one of the non-caching CPU's - a MICRO-11/23/53/53+.

Sure, but switch from RSX to go to Unix for real-time?  RSX, the only
operating system in the known universe that allows you to assign your
process a higher priority than the kernel.  We're talking all the control
you want with RSX.  It's not crude (read: non-luxuriant) for nothin'.

My original reply was to a fellow that asked about Unix on a PDP 11/23 or
trade in the 11/23 for an 11/73.  Naturally my comments were geared to the
merits of running Unix in, what appeared to me as, a home environment.

BTW, a poster complained about my comments on power consumption and
offered no contribution seems to be the whiner to me.  Especially, when I
was only trying to help somebody.  It was price and performance that was
central to my argument, not power consumption.  Obviously, there are
*much* better ways of heating your house.  {snarl}

>> Maybe cost you $2,500, US just for a used processor board, KDJ11-BB in
>> Digital Basics.  Now add $4,200 for a meg of memory...  Hope you like
>> segmented architecture, cause thats all ya get.
>
> $4,200 for a 1 meg Q-bus memory board?  Someone's a thief.

No, someone just goofed up.  That price is for the KDJ11-BB *and* one (1)
MB memory *in* a BA23-A.  Oooops.  I never read that catalogue right. 

Anyway the price is more around $650 for a meg of MSV11-QA.  A re-read of
that price does sound ludecrus since the *processor* is $2,500.  In a very
nasal voice, sorry about that chief.  BTW, for the record, I do *not*
speak for Digital Basics.  I just misquote their catalogue contents.  :-}

> Given that I have 11/53's (and an 11/73) spinning their wheels, 
> how DOES one go about getting a copy of 2.9/2.10 BSD?  How much 
> $$$ would it cost?  Not that it matters, but these guys are 
> currently running RSX-11M+ using I/D space.

What, you don't like MCR?  Gee whiz.  To more directly answer your
question though, it is Copyright (C) Board of Regents, Univ. of
California, at Berkeley. 

Cheers!

- randy

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