OpenEuphoria

Re: Euphoria on DOSbox

• Posted by CChris <christian.cuvier at a?ri?ulture.gouv.fr> Oct 30, 2007
• 844 views

olddog wrote:
> 
> Is there anybody out there who has a copy of the source and who knows how
> to work with compilers who would be willing to join an experiment?
> 
> If you could re-compile Euphoria for DOS using the DOS/32a open-source
> DOS extender (instead of Causeway), there is a good chance that the
> common DOS emulators could run it, including PocketDOS for the pocket PC.
> 
> This could open up a whole new realm of application for Euphoria.
> 
> Is anybody willing to try this and share the resultant ex.exe with us?
> I'd be happy to do some testing on my pocket PC (Dell Axim x50v).
> 
> Thanks!
> 
> 
> Robert Craig wrote:
> > 
> > olddog wrote:
> > > Apparently, the old DOS game Doom can run on PocketDOS, using the DOS/4GW
> > > DOS
> > > extender,
> > > for which there is a drop-in open-source replacement, DOS/32.
> > > 
> > > Is it possible to compile Euphoria for DOS using a different DOS extender,
> > > which
> > > may
> > > then run under PocketDOS on a Pocket PC?
> > > 
> > > Thanks for any help.
> > 
> > Euphoria used to use DOS/4GW a long time ago.
> > The DOS extender could reside in a separate file,
> > or could be combined with the Euphoria interpreter .exe file
> > to make a single .exe file. They charged you extra
> > for the privilege of making a single .exe file.
> > 
> > I don't think you'd even have to change the
> > Euphoria C source code to use it again.
> > It just involves some trivial change to the way
> > you link the object files using Watcom,
> > perhaps not even that, if the extender is separate.
> > 
> > The Watcom, DOS/4GW or DOS/32 docs should
> > have an explanation of how it's done.
> > I know it's very easy, but I don't remember the
> > details off-hand.
> > 
> > Regards,
> >    Rob Craig
> >    Rapid Deployment Software
> >    <a href="http://www.RapidEuphoria.com">http://www.RapidEuphoria.com</a>

Really?
The code in be_machine.c has some interrupt #31 calls which are specific to
Causeway according to RBIL v61:
* long_to_short(): AX=#FF21 (GetMemDOS) and #FF01 (RM interrupt)
* InitGraphics(): AX=#FF08 (GetSelDet32)
* user_allocate_low(): AX=#FF21
* user_free_low: AX=#FF23 (RelMemDOS)
* dos_interrupt: AX=#FF01

So... I expect these areas of the backend source will require some alternative
variant selected by an #ifdef ... #else directive.

CChris