From:	"Alexei A. Frounze" <see_below AT the_message_body DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: far pointers
Date:	Sat, 10 Jun 2000 02:46:40 +0400
Organization:	None
Lines:	33
Message-ID:	<394173D0.3EF74969@the_message_body.com>
References:	<39405DEE DOT 89226F7B AT ccs DOT iitb DOT ernet DOT in> <m3d7lrxohw DOT fsf AT vsnl DOT net DOT in> <m3itviofxb DOT fsf AT vsnl DOT net DOT in> <39415453 DOT 5E434718 AT is DOT elta DOT co DOT il>
NNTP-Posting-Host:	ppp98-170.dialup.mtu-net.ru
Mime-Version:	1.0
X-Trace:	gavrilo.mtu.ru 960590985 51335 212.188.98.170 (9 Jun 2000 22:49:45 GMT)
X-Complaints-To:	usenet-abuse AT mtu DOT ru
NNTP-Posting-Date:	9 Jun 2000 22:49:45 GMT
X-Mailer:	Mozilla 4.72 [en] (Win95; I)
X-Accept-Language:	ru,en
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Eli Zaretskii wrote:
> 
> Thanks.  Some comments:
> 
>      In V86 mode, the 386 operates in real mode but allows some programs...
> 
> I believe you meant to say "protected mode".

yup.

>   That means programs like DOS can coexist with protected-mode programs.
> 
> I don't think V86 has anything to do with RM and PM programs coexisting.
> perhaps I'm missing something in your reasoning.

:) V86 mode was invented to provide compatibility with old 8086 stuff while
CPU is in PMode. DOS itself works normally in V86. I think he is correct.

>   The memory management unit (MMU) on the 386 supports virtual memory
> 
> This is inaccurate: VM is not implemented by MMU, but by software that hooks
> the Page Fault exception and pages memory in and out as needed.

Perhaps he meant multiple V86 tasks... From Virtual 8086 point of view it's
a virtual memory. Of course it has nothing about memory swapping.

bye
Alexei A. Frounze
-----------------------------------------
E-mail:   alexfru [AT] chat [DOT] ru
Homepage: http://alexfru.chat.ru
Mirror:   http://members.xoom.com/alexfru

- Raw text -