It will soon be obsolete. Most people would not notice but it's a shame. HP support is excellent generally although sadly they dispensed with their in-house Engineers a while ago. I am told they have now outsourced on-site maintenance altogether. See if you can find one of their old service engineers now self-employed.
Modern plotters tend to connect to the parallel port on the back of the PC or a USB port.
This is easy and fast to set up. If you think of how often you tend to print out an A4 page from your desktop printer when word processing and find a mistake and then print the sheet again the same thing happens with CAD drawings. The paperless office is a long way off. I do all my copies on the plotter as you can just punch in the number of copies - not as fast as a large format photocopier but much better line quality. You can only do this with roll feed plotters.