The hardware on the TI-83 link is identical as the TI-82 (and TI-92) links. So there is no need to buy new hardware. There is new software still in beta but it works very well. The software can be downloaded at www.ti.com/calc (but I never can seem to get in to get the latest update!)
PS. For the Mac, for the TI-83 you can choose between the modem and the printer ports. If you do use the software make sure that you have selected the appropriate one in the software.
Albert Coons Mathematics Department Buckingham Browne & Nichols School Gerry's Landing Road Cambridge, MA 02138 (617) 547-6100 AlCoons@aol.com