While the HP computers and calculators were well documented and their design process was also frequently described in HP Journal or other HP publications, the most valuable HP publications were about their measurement instruments.

Many of the ancient service manuals for HP measurement instruments were much better for learning electronics engineering than most university manuals.

I understand, but that’s a shame.

Way back, talking 1980 or so, my father got a newsletter cum magazine of sort from HP. Marketing material to be sure, but not just raw marketing. Some corporate organ that could easily been called something like “HP Today”.

But inside was, at the time, a science fiction story about handheld computers in the future. It was a fascinating bit of “snapshot in time” that I would enjoy seeing again.

In the off-topic calculator department: hpcalc.org :)

I have an HP 48 (series of graphing calculators) overhead projector display (InVision 48) that may need refurbishment to work, but I just found the manual at hpcalc.org.[0]

0. https://literature.hpcalc.org/items/1290

Yeah, too bad it had not been digitized sooner.

I’m sure someone has done this, but it would be interesting to study the overall tech landscape and compare which technology has sort of retained its value, depreciated, or increased in value—and how long those phases take. Even as far back as things like cast-iron printing presses and such. I mean also value in terms of usage not necessarily monetary.

The cycles we go through where a new tech supplants an old one, people thinking it’s the way of the future, and the old processes maybe forgotten for a while. Some might come back, others completely obsolescent. Still others the old tech might be superior to new—but more expensive (like old hard-wood window panes) and not sustainable.

I think I have this scope or a very similar one. I got it for free from someone else. (currently in storage.) It's a great hobbyist scope although mine doesn't have a DFT function which can be annoying. I've been borrowing a friend's modern digital scope when I've needed one. I think he only paid a few hundred for it. It's a little faster and has some more modern functions.

EDIT: Oops nope. Looked at the model number rather than the brochure. That's definitely an older analog scope while mine is digital.

IBM - AIX

DEC - Ultrix/Digital Unix

Apple - A/UX, macOS

HP - HP-UX

SGI - IRIX

Sun - SunOS, Solaris

It's not complete but there's this:

https://github.com/calmsacibis995/irix-6517-src

My father did a stint at HP long ago, before my time.

The thing that I wish he had snagged more of (which HP actively encouraged engineers to do) was the HP branded prototyping boards that fit DIP package ICs nicely and had power/ground rails with detached shared signal busses.

200A sounds interesting, as that was their very first model number. Your relative didn't have anything to do with Disney, did they?

If the website didn't use some annoying click tracking redirection or javascript, try the old standby: https://archive.org