File:Deutsches Museum - Hewlett-Packard 8-Farb-Trommelplotter HP 7585 B, Bj. 1984.JPG - Wikimedia Commons
![Paul Rickards on X: "This is the HP 7585B plotter motor power section that connects to the backplane via headers. I'm impressed by the modular engineering. Time to test these power transistors. Paul Rickards on X: "This is the HP 7585B plotter motor power section that connects to the backplane via headers. I'm impressed by the modular engineering. Time to test these power transistors.](https://pbs.twimg.com/media/DXFQMxgWkAEKlwX.jpg)
Paul Rickards on X: "This is the HP 7585B plotter motor power section that connects to the backplane via headers. I'm impressed by the modular engineering. Time to test these power transistors.
![USER MANUALS FOR HEWLETT PACKARD HP PEN PLOTTERS 7580B, 7585B & 7586B | Printers & Scanners | Gumtree Australia Cairns City - Cairns | 1287409010 USER MANUALS FOR HEWLETT PACKARD HP PEN PLOTTERS 7580B, 7585B & 7586B | Printers & Scanners | Gumtree Australia Cairns City - Cairns | 1287409010](https://gumtreeau-res.cloudinary.com/image/private/t_$_20/gumtree/1e59b71c-11d5-4382-ba3b-57a9ab1233df.jpg)