Date: Fri, 14 Mar 2003 22:05:13 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: Problems adressing memory variable
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>  char * disp_str = "Hello!";
>         output.x.bp = ((disp_str[0]) >> 4);
>         output.x.ss = (((disp_str[0]) << 4) >> 4);

Addresses in DJGPP are *not* segment:offset.  They are 32-bit linear
offsets into a protected segment (i.e. all DJGPP programs are TINY
mode, not far mode).  If you want to pass data to a DOS function like
this, you *must* copy the data to DOS memory and calculate the seg:ofs
of that buffer.  You'll need to use something like dosmemput() or
<sys/farptr.h> and the transfer buffer defined in <go32.h>.