*BSD News Article 5743


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Newsgroups: comp.unix.bsd
Path: sserve!manuel!munnari.oz.au!uunet!europa.asd.contel.com!darwin.sura.net!jvnc.net!yale.edu!think.com!rpi!psinntp!psinntp!ficc!peter
From: peter@ferranti.com (peter da silva)
Subject: Re: 386BSD - what a pain to install!
Message-ID: <id.X7NT.904@ferranti.com>
Organization: Xenix Support, FICC
References: <19r472INNnot@corax.udac.uu.se> <1992Sep27.020909.2692@cs.unca.edu> <1992Sep27.091749.2076@fcom.cc.utah.edu>
Date: Mon, 28 Sep 1992 21:29:05 GMT
Lines: 22

In article <1992Sep27.091749.2076@fcom.cc.utah.edu> terry@cs.weber.edu (A Wizard of Earth C) writes:
> The memory protection on a 286 is rather primitive as well, and it's difficult
> to limit address spaces.

This is only partially true.

> This is generally accomplished (by Xenix, as an
> example) by only running code in medium model, where you have unlimited text
> (read only) pages per program, but only 64K (1 segment) of data (read/write)
> pages.

This is not true.

We've been running Xenix-286 for years with multiple data and multiple code
segments. We're talking applications with megabytes of both.

Of course, I wouldn't recommend segmented memory to anyone for *fun*!
-- 
Peter da Silva                                               `-_-'
Ferranti Intl. Ctls. Corp.                                    'U` 
Sugar Land, TX  77487-5012
+1 713 274 5180                                   Har du kramat din varg idag?