I just did a search of HP's and Agilent's web sites. Not much there for the 7470. You may have to contact HP directly. I have worked with some of the old pen plotters, they are pretty simple for the most part. Commands include PENUP, PENDOWN, PEN #, MOVETO, etc. All of the old plotters that I've worked with had the same style of commands.
If you can't get something, let me know (rcole@cell-loc.com) and I'll see if I can dig up the manual for the one old plotter that we have here.
Rob
