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From: "Rod Pemberton" <dont_have AT bitbucket DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: code from BC31(16bits) to DJGPP(32 bits)
Date: Wed, 30 Nov 2005 09:31:11 -0500
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<blk5743 AT yahoo DOT com DOT tw> wrote in message
news:1133323344 DOT 550990 DOT 86450 AT g49g2000cwa DOT googlegroups DOT com...

That all looks correct to me, but I haven't used XMS or VDS before.  I just
use DPMI.

>     i will get a XMS Block Address: ulXMSBlockAddr = (DX<<4+BX) or
> should be (DX<<16+BX)????

(DX<<4+BX)

>         PRD_EDDS.Offset = __djgpp_conventional_base+&r_buffer,
> PRD_EDDS.Segment = 0;???

>         PRD_DDS.Segment = 0;//????
>         PRD_DDS.Offset =(ULONG)PRD_Table+__djgpp_conventional_base;

Segment is zero because the VDS spec. says: "Note that if the linear address
has already been determined then you may set the segment/selector field to 0
and place the linear address in the linear offset field."  I hope that
works.  I didn't want to try segment or selectors here because it gets to
confusing.  If not, the addressing will need to be changed.

Thanks for the code offer!  But I don't need it.  I hope it all (eventually)
works.


Rod Pemberton