🚀 go-pugleaf

I'm writing a data acquisition/machine control application using BC and
National GPIB using National's software library, huge model.  Ran into a
most curious bug:  one of my constant strings came out with snot in the
middle of it.  Worked fine before--until I split the source file in two for
easier handling.  Reason:  TD reveals that one of my GPIB functions is
stomping on it, and the reason for that is that the data segment for the
GPIB functions is getting merged with the data segment for main(), but the
calls are from another module, and DS is set for the data segment for that
module.  I'm following directions (don't tell me to RTFM) that came with it,
which said the large library works with the huge model--or maybe Borland
changed how their huge model works.  Calls work fine if I change DS to
main's DS immediately before each 'call far _function' and then change back
on return, or if I cram all the source into one module (which is almost too
big a meal for the compiler).  

So, how do I either get the linker to merge the data segment with the one
that calls all the functions (there is only one), or fix it for real--so
that any module could call the GPIB.