FYI hpgl is well supported under Linux and there are utilities to convert
between hpgl and other formats. I also read somewhere about a GPIB card
that is supported under Linux. Maybe someone else has the details or use a
search engine. Iow, it should be feasible to replace the plotter with a pc
running linux (maybe it's already there) with a GPIB interface run in
slave mode and use native tools to handle the output format. Building an
interface from scratch using a parallel port and standard HCMOS buffers
and writing and testing a driver from scratch is a 4-8-hour job.

Peter

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