http://www.summa.be/download/dmp-40v.pdf http://bratlady.com/hiplot/manual/dmp-60chap3.pdf http://www.winline.com/evalpen_dmpl.html
Only references I can find. If I can't solve an HP/GL conversion, guess I'll drop $200 on software http://www.winline.com/evalpen.html for a raster to vector print driver. More universal anyways..
