Hi Butch, and welcome to the forums. Like Mark hinted on, most knowledgeable people for your question will be in the 'TASCAM DM-3200 & DM-4800' section of the forums.
I own a DM3200 plus IF-FW mk2, but don't know anything Mac, so try to ask your question in the appropriate forum. I know the IF-FW works with most older Mac OSes, but not the latest one(s?).