Guys,
I was pretty sure I had got it working before, so I didn't want to just
leave it as it is. What I just did is restart my computer with plain FreeDOS
and wrote, compiled and executed a programme like this:
mov ax,0b800h
--- On Tue, 27/10/09, japhethx gmail <[email protected]> wrote:
From: japhethx gmail <[email protected]>
Subject: Re: [Freedos-devel] About my driver, HIMEM/EMM386 and interrupts
To: [email protected]
Received: Tuesday, 27 October, 2009, 4:56 PM
>> However, I understood that HIMEM did something like establishing a
>> routine that was run whenever you tried to use an offset greater than
>> 0FFFFh together with a "real-mode-made" segment. This routine would
>> "trap" the event and handle the switch to protected mode and back,
>> keeping the segment base, but extending the limit to 4G, then returning
>> to the instruction that generated the exception. Am I right? Does this
>> really happen? If so, programs should not mind about their segments
>> being initially setup in real mode.
>
> No, I'm not aware of any Extended Memory Manager (XMM) that does such a
> thing.
MS Himem does indeed "install" such a routine, but it is installed only during
XMS block moves inside Himem.
See the MS Himem source for details. It's Public Domain, IIRC.
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