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From: braun@m10ux.UUCP (MHx7079 mh)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Switching from Protected to Real Mode
Message-ID: <328@m10ux.UUCP>
Date: Fri, 21-Aug-87 16:42:51 EDT
Article-I.D.: m10ux.328
Posted: Fri Aug 21 16:42:51 1987
Date-Received: Sun, 23-Aug-87 11:33:43 EDT
References: <1387@imagen.UUCP>
Organization: AT&T Bell Labs, Murray Hill
Lines: 21
Keywords: 286
Summary: Microsoft "research"

In article <1387@imagen.UUCP>, geof@imagen.UUCP (Geoffrey Cooper) writes:
> Is there a way (I deduce from recent net messages that there is) for a
> program to switch from 286 protected mode back to real address mode,
> without rebooting the machine?  

I read in one of the trade magazines (Electronic Engineering Times)
a few weeks ago that Microsoft announced that a research team of theirs
had discovered a way to do this without a hardware reset.
It involves something wacky like a double fault.
They also announced that they would be patenting this.

Microsoft really seems to have developed an attitude here.
First, they equate finding a hack with "research",
and then they expect a hack to be patentable.

This, and the fact that IBM wants to patent their micro-channel
bus specification sort of make me gag.
-- 

Doug Braun		AT+T Bell Labs, Murray Hill, NJ
m10ux!braun		201 582-7039