Here is a message I got on this a while back…
19820 3rd Party Software
23-Feb-88 03:16:10
#hpgl – DXFIN
From – CHARLES CHESTER 73417,1126
Jamie, I read a message that was interested in taking HPGL output
and DXFIN to AutoCad. There is a program written by John
Leavines, (318) 448-0274 that will solve this problem. Call John
directly or leave a message with me for interested parties. Approx
cost is about $20, I think. I've used this program as well as the
one that translates H-I plotter outputs to AutoCad and they work fine.
—–
As for going from DXF to HPGL, AutoCAD can do that part by selecting the
PLOT to file option for an HP plotter.
Jamie