If you want to pull hair on the TS950SDX go to www.kenwoodparts.com and go to parts search and put in 27c512. I think I count 6 different versions of the 950SDX software. Several of the 870. The SD has several under 27c256 as does the 850..... More than just 1 or 2 versions out there. Clif Holland KA5IPF www.avvid.com