Here is a listing of several cables Claris knows to work correctly with the MacPlot software:
Apple Computer: the Mac to IW I cable, with DB9 to DIN8 adaptor, Service Part #'s 590-0169 & 699-0430. (This is two cables: a Mac II-to-DB9 adapter, and a Mac Plus-to-ImageWriter 1 cable)
Hewlett-Packard: 17302A (an all-in-one cable, 25 pin to DIN8). This is the best solution to hook up a plotter with a 25-pin connector to any Mac with a DIN8 serial port (i.e., any model Mac later than a Mac Plus).
Hewlett-Packard: 92219M (same as ImageWriter I cable) and any DB9 to DIN8 adaptor.
Roland: XY-2606.
Sun Remarketing (800-821-3221): DB25-DN8 cable is $24, part number 330-013 (direct connect between plotter and Macintosh). DB25-DB9 cable is $24, part number 330-011. DB9-DN8 adapter is $10, part number 330-003.
Claris cannot guarantee that other cables, especially custom cables, will work with MacPlot.