Sender: nate AT cartsys DOT com
Message-ID: <35B252BB.D77335E8@cartsys.com>
Date: Sun, 19 Jul 1998 13:10:35 -0700
From: Nate Eldredge <nate AT cartsys DOT com>
MIME-Version: 1.0
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
CC: Charles Sandmann <sandmann AT clio DOT rice DOT edu>,
        Martin Str|mberg <ams AT ludd DOT luth DOT se>, djgpp-workers AT delorie DOT com
Subject: Re: info core dumps
References: <Pine DOT SUN DOT 3 DOT 91 DOT 980716192048 DOT 19025A-100000 AT is>
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Eli Zaretskii wrote:
> 
> On Sun, 12 Jul 1998, Charles Sandmann wrote:
> 
> > > EMM386 is loaded. This is the first two lines from my CONFIG.SYS:
> > >
> > > About the interrupt call, do you mean CWSDPMI should do that?
> >
> > No, if an application is going to access the HMA they must make sure
> > it's "on".
> 
> Can someone please direct me to the interrupt call which turns on the A20
> line to make sure HMA is accessible?  I want to add that call to the conio
> function which accesses the font table in the BIOS.

Looks like there's an XMS call, and also perhaps a BIOS call.  The BIOS
is INT 15h/AX=2401h, and XMS seems to be a far call with AH=03h or 05h
(not sure which one is appropriate).  See the INTLIST.

Seems to me it would be a good idea to turn it on at the start of the
program's run, and leave it at that.
-- 

Nate Eldredge
nate AT cartsys DOT com