Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!usc!apple!motcsd!xdos!doug
From: doug@xdos.UUCP (Doug Merritt)
Newsgroups: comp.sys.amiga
Subject: Re:  Lies, lies, they're telling us lies...
Summary: Minix does.
Keywords: page,zero,386
Message-ID: <561@xdos.UUCP>
Date: 2 Dec 89 16:16:11 GMT
References: <5003@nigel.udel.EDU> <4385@eagle.wesleyan.edu> <1469@dfsun1.electro.swri.edu>
Reply-To: doug@xdos.UUCP (Doug Merritt)
Organization: Hunter Systems, Mountain View CA (Silicon Valley)
Lines: 17

In article <1469@dfsun1.electro.swri.edu> fenske@dfsun1.UUCP (Robert Fenske Jr) writes:
>>> [ attribution lost: ]
>>> of copying the entire contents of page zero, out and in, etc. etc.  Of
>       ^
>       ^
>Does ANY OS do this sort of thing now days?  I thought this stuff went out
>with the '70's.

Yes, Minix does this, at least on the Atari and on the semi-mythical
Amiga port of it. It's been a long time, but if I recall correctly even
on the PC it does task switching by copying the contents of the address
space around, to get around the lack of MMU. So it's even worse than
just "page zero".
	Doug
-- 
Doug Merritt		{pyramid,apple}!xdos!doug
Member, Crusaders for a Better Tomorrow		Professional Wildeyed Visionary