Thanks a lot for all this information everyone.
This gave some light to guide my presentation to the client.
Rafael R. Machado
2013/8/29 Andrew Fish <af...@apple.com>
>
> On Aug 29, 2013, at 9:55 AM, David Woodhouse <dw...@infradead.org> wrote:
>
> >>
> >> Then there are problems with getting the hardware into the correct
> >> state. Like needing a BIOS Option ROM to get the video controller in
> >> VGA mode (DOS code can poke the video memory directly).
> >
> > Well, if your app really assumes VGA hardware and was broken with
> > EGA/MDA/etc then yes, that'll suck. But if you have a proper video BIOS
> > for the hardware, or if you can just use ask UEFI for a linear
> > framebuffer and then provide INT 10h services using that, you may be
> > able to achieve something useful.
>
> EGA, good old 1984 technology from my collage days...
>
> The 80x25 text mode buffer at 0xB8000–0xBFFFF goes all the back to Black
> and White Hercules days. Back in the 1980's the UI would be slow if you did
> INT 10, so best practice was to have your 16-bit real mode assembly code
> poke the text mode frame buffer directly. I wrote some BIOS serial
> redirection code back in the 1990's and I had to track the deltas in the
> video buffer and send those deltas out as PCANSI escape sequences. So INT
> 10 by its self is not enough.
>
>
> I'm also guessing that this magic DOS program is some kind of diagnostic
> or manufacturing tool, so running it under an OS VM may not let it touch
> hardware like it needs to.
>
>
> Thanks,
>
> Andrew Fish
>
>
>
>
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