SQL Server version and TDS Version

Hi,

I am running FreeTDS on my Mac OS X connecting to Microsoft SQL Server
2005, so version 9 of MS SQL.  In order for "tsql" to work, I have to
set the TDS version to be 4.2.  However, according to the
documentations, shouldn't TDS version 7.0 and 8.0 work as well?  What
can I do to get these versions to work?

My ultimate goal (for now) is to get freeTDS to work with unixODBC
(isql and osql commands -- ultimately in emacs).  However, even though
I can connect to the sql server using tsql, I can't with isql and osql
-- it won't log me in.  I have a hunch that this has to do with the
TDS version.  If I could get tsql to work at v8.0, then I can test the
isql/osql commands again to see if I can rule this out.  I know
unixODBC is recognizing my DSNs.  It just can't log in.

Please let me know of your suggestions.  I couldn't find an answer googling.

Thanks!
Vinh