I saw the service manuals for an hp9125 on ebay; there is no mention of it anywhere in the MoHPC, other than a solutions pack in the 4th CD. Does anyone have any pictures, information, introduction/discontinuation dates?
/ji
It's the plotter for the 9100A/B. Dave lists it by number in the 9100 page and also mentions it in a historical note on that page.
On the front page of this site there's link to a search page. I typed hp9125 and it brought up the page that Ellis already mentioned. You can dig up all sorts of things this way.