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From: dj@ctron.com (DJ Delorie)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Protected mode/Real mode switching
Message-ID: <1448@balrog.ctron.com>
Date: 25 Apr 91 15:52:38 GMT
References: <1991Apr15.160333.8107@msuinfo.cl.msu.edu> <37390009@hpopd.pwd.hp.com> <3199@bimacs.BITNET>
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Reply-To: dj@ctron.com
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Lines: 18

In article <3199@bimacs.BITNET>, orenalex@bimacs.BITNET (oren alex) writes:
> In article <37390009@hpopd.pwd.hp.com> dcc@hpopd.pwd.hp.com (Daniel Creswell)
> writes:
> >Hope thats some help - I guess a Microsoft programmer on the Windows team'd
> >be perfect for this question.
> 
> Wasn't there an undocumented "load all" function?
> Could it help?

There is such an opcode, and Microsoft used it in OS/2 for 286
machines.  From what they told me, they had a really hard time getting
Intel to tell *them* about it.  They used it primarily to set up the
hidden portion of the segment registers in real mode to access memory
above 1M.  It is *not* available on the 386, and may not exist on new
286 designs, or on non-Intel 286's.  It's very non-portable, also.

DJ
dj@ctron.com