Richard wrote: As difficult as it is to find information on vintage terminals, its even harder to find information on vintage pen plotters. A pen plotter was about the only form of graphical output you could expect to see on a vintage graphics system as film recorders were very expensive. OK, what do you have in your collection(s)? -- --------------------------------------- Have a Calcomp 565 drum pen plotter circa 1963. Includes manual with schematics. And also has someone's home brew interface design to an 8080 on a paddle board. Do have a few manuals on other plotters. Recently found one on a Houston Instruments plotter. It'll go to Al the next time we get together. Billy