Curve Plotter for Diablo?

[VLD/VMB]

Diablo Hytype II mechanisms are supported by "tplot -T450",
which uses the period (make sure you have a metal-reinforced one)
hammered all over the page to draw vectors.  Not terrific, but
it already comes as part of the standard UNIX plot utilities so
you may as well use it.  An improvement might be to rasterize the
vectors and print rows of dots in raster order; this would usually
be slower.

As to the software for generating the device-independent plot data
in the first place, look up graph(1G) and the graphics(1G).  The
"gtop" utility can convert the latter (GPS-based) graphics to UNIX
plot(4) format with some loss of beauty.