TI sells the adapter by itself too, at http://www.ti.com/calc/docs/store.htm or you can just go to a computer store (Best Buy, etc.) and get one. >Yes to the serial port. Ti sells the graphlink and the adapter (for a >whopping $50+). I just want the adapter (preferrably from $10 to $15). I >believe the adapter has to have a 25 pin male parallel connector at one >end and a mac modem port connector at the other.