Guys, I've uploaded the new official 33.6kbs supra rom flasher for Macintosh external SupraFaxModem 288. Some older SupraFax 288's will not take this flash straight up (and will need a $40 or so firmware upgrade at the Supra Factory). To test your modem type:
ATL7 in a terminal program. If you get the return code 04BC, you will need the factory update If you get the return code 05BA, you can flash away pronto!
Enjoy! I updated my SupraFax288 already. I don't think you're supposed to get any benefit unless both sides are upgraded, though.