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From: david@ukma.UUCP (David Herron, NPR Lover)
Newsgroups: net.micro.68k
Subject: Re: Re: Re: Re: Info on OS9 Operating System
Message-ID: <2283@ukma.UUCP>
Date: Thu, 10-Oct-85 11:34:02 EDT
Article-I.D.: ukma.2283
Posted: Thu Oct 10 11:34:02 1985
Date-Received: Sat, 12-Oct-85 21:32:16 EDT
References: <347@wlbr.UUCP> <9500001@datacube.UUCP> <126@mcrware.UUCP> <275@graffiti.UUCP> <138@mcrware.UUCP>
Reply-To: david@ukma.UUCP (David Herron, NPR Lover)
Organization: Univ. of KY Mathematical Sciences
Lines: 27

In article <138@mcrware.UUCP> kim@mcrware.UUCP (Kim Kempf) writes:
>> 	2) True, but... I don't want to do serious work on a machine without
>> 	   an MMU any more. It's so frustrating... even sickening... to watch
>> 	   a lost pointer or bad copy of foocalc blow away everything & write
>> 	   garbage over a:\*.*
>> 
>The MMU does a little more than protect memory.  It allows manipulation of a
>process' logical address spaces.  In fact, the UNIX fork system call CANNOT
>operate without an MMU (or some type of segment/base register allocation
>scheme [ala 80*86]). 

Tell that to the people who put together V6 Mini Unix.  We ran that sucker
on a PDP-11/10.  NO mmu in that beast.  And it regularly died every time
you had a pointer fault in your C program.

It was bad enough that the friend of mine that ran the machine patched
up the shell so it would sync every time it printed a prompt or ran
a program.  This way he wouldn't have to fix the disk so often. (No fsck).

Sorry, I don't know any details of the system -- The only time I really
looked at V6 was as an intelectual exsercise, I needed to understand
the basic design structure of Unix.
-- 
David Herron, ukma!david@ANL-MCS.ARPA, cbosgd!ukma!david
(Soon -- david@UKMA.BITNET, and (hopefully) david@ukma.csnet)

Hackin's in me blood!  My mother was known as Miss Hacker before she married!