Funnily enough, googling Eric Auer Dosemu, led me straight to
http://sourceforge.net/p/dosemu/mailman/message/2149777/
Which seems to be a your discussion of the Win31 implementation..
On 3 June 2014 20:32, Stas Sergeev <s...@list.ru> wrote:
> 03.06.2014 22:31, Eric Auer пишет:
> > Hi!
> >
> >> The proper win31 support happened because an author of hx
> >> extender shared a few tricks with us how to do that. That even
> >> involved things contradicting with the dpmi specs. He wrote
> >> hdpmi server that was able to run win31 before dosemu did.
> > Interesting! When was that and which anti-specs features
> > were required? Maybe you can email details to the list?
> Eric, there is no secret here, but this was so long ago
> that it is mostly lost.
> What do you want to do with that info? Write your own
> dpmi server?
> For example he suggested to alter the exception routing
> rules. While dpmi spec says unhandled exceptions 1..5 and 7
> should generate real-mode interrupts, he suggested to
> call the protected-mode handlers instead, and if there
> are none - terminate the client, but never call the real-mode
> interrupt the way spec does.
> Also there are many undocumented things, for instance,
> the limit of LDT selector must dynamically grow when
> you allocate the descriptors in LDT.
> There is a summary on undocumented DPMI:
> ftp://ifctfvax.harhan.org/pub/micro/msdos/above640k/TrueDPMI/dpmiext.txt
> but it documents actually nothing of what we didn't know
> ourselves. The most important and difficult to discover
> things are not in that doc.
>
> After that, I did an attempt to port dosemu's PM api
> translator to DOS. The idea was to make it runnable
> under different "weak" dpmi servers (like cwsdpmi),
> making them able to run windows. I even wrote the
> code and it mostly worked. But now its dropped
> because it is difficult to compile DOS code under linux.
>
>
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