The Sony plotter needs little ballpoints, red, green, bleu and black, and support 2 mode's graphic and print.
I'v wrote a program for it , you can get a pre release, because the final release is not ready yet. todo MSXDOS 2 and Harddisksupport
the pre supports mouse and graphic tablet, I'v implement the basic. drawingfunctions , line, circel, ellips, box, rectangle, handdrawing and scale
The file in and output is HPGL (Hewlett Packard graphic language)
Most vector orientate cad apps support HPGL output.