Xref: utzoo comp.unix.xenix:3317 comp.unix.microport:1532
Path: utzoo!attcan!uunet!sco!chapman
From: chapman@sco.COM (Brian Chapman)
Newsgroups: comp.unix.xenix,comp.unix.microport
Subject: Re: Programs larger than real memory on an 80286 ???
Message-ID: <544@sysco>
Date: 13 Sep 88 18:10:33 GMT
References: <235@extro.ucc.su.oz> <466@uport.UUCP> <183@fsc2086.UUCP> <1988Sep11.222005.14450@gpu.utcs.toronto.edu>
Reply-To: chapman@sco.COM (Brian Chapman)
Organization: The Santa Cruz Operation, Inc.
Lines: 17

In article <1988Sep11.222005.14450@gpu.utcs.toronto.edu> woods@gpu.utcs.Toronto.EDU (Greg Woods) writes:

< Mr. Geers' gripe is a legitimate one.  Apparently the 80286 has been able to
< support virtual memory systems, yet the 80286 OS designers chose to leave it
< out.  I would be interested in hearing why.

I asked the same question about 2 years ago when I read that
same section of the 80286 chip book.  I was told that there
was a chip bug where not all the instructions were restartable
when you got a "segment not present" fault.

I cannot be more exact that this.  I do not know which instructions
are not restartable and I have never seen anything in writting from
Intel admitting this error.
-- 
	Pay no attention to the man behind the curtain.
Brian Chapman		uunet!sco!chapman	UNIX Development