I came across (by accident) a site that is devoted to the 9825 calculator (http://www.hp9825.com).
Although incomplete (the actual 9825 pages appear to be missing), it contains a very informative and extensive history of HP up to the introduction of the 9825. I am sure that the site's curator (Steve Leibson) will continue to add to the material.
I found very charming the item about Bill Hewlett's involvement in the 9100 project. He specified the 9100's dimensions by asking his product engineers to built a calculator that would fit on a pull-out typing stand built into his wooden work desk. When the 9100 protype was finished, the engineers tried to fit it in Bill's desk,
but it would not fit. Since Hewlett was not present, they fixed the desk, by asking a shop carpenter to enlarge the opening.
Another item I found really amusing was the TI fighter going after the HP-ship cartoon:
**vp