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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: Mon, 28 Nov 2005 10:12:58 -0500
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<blk5743 AT yahoo DOT com DOT tw> wrote in message
news:1133146328 DOT 335307 DOT 54810 AT g44g2000cwa DOT googlegroups DOT com...
> sorry, i got confused to change source code form bc31 to djgpp
> should i change the following code because i changed compiler
>
> regs.x.di = (WORD)(&PRD_EDDS);for bc31
>
> i should use
> reg.x.di = (WORD)(&PRD_EDDS); for djgpp
> or
> reg.x.di = (DWORD)(&PRD_EDDS); for djgpp
> **************************************************************************
>
> offset32 = _ES << 4 + _BX; for bc31
>
> i should use
> offset32 = _ES << 4 + _BX; for djgpp
> or
> offset32 = _ES << 16 + _BX; for djgpp
>
> Thanks for your help

Both of these are the same...

offset32 = r.x.dx << 4 + r.x.bx
offset32 = r.x.dx * 16 + r.x.bx

When you use dosmemput/get to copy to __tb, all three are the same...

offset32 = __tb;
offset32 = __tb_segment << 4 + __tb_offset;
offset32 = __tb_segment * 16 + __tb_offset;


RP