Can you print out from HPGL .PLT files from your computer system? If so, can you rotate it by 90 degrees? Or do you have a graphics converter than can convert .PLT file to .JEPG or .GIF format. I can make a .PLT file from my CAD file, but only in landscape orientation. I can rotate the CAD drawing file so it's in landscape orientation, which is fine, but it's a stinker of a job for me to convert it back to a portrait orientation output graphic. I have to convert .PLT to bitmap (.BMP) then use MSPaint to rotate that to portrait orientation, then convert the rotated .BMP to .JPEG or GIF. [This is how I made the just intonation slide rule on my website]