> DG/UX for x86, CTOS, AOS, and RDOS are already included.

Wow! Thanks. I didn't see a list of available titles, so I just shot those blindly. And I never imagined DG/UX for x86 was a thing. I'm pleasantly surprised.

> I'm not sure if IBM would care all that much if somebody wrote an emulator for IMPI AS/400s

They might complain loudly about software copyright - it's not the same thing as VM/370 and MVS 3.8j. S/32 and 34 will most likely have the same issue.

> I've never seen images anywhere for NonStop, VOS, or NIROS, nor do emulators exist for the original hardware they ran on.

NonStop and VOS under x86 might draw some fire, and they would also require emulation of the specific hardware - they run on x86, but not on PCs. As for NIROS, you are right, but Nixdorf might be more amenable to even supporting building emulators (they have a very nice museum in Germany).

I would avoid those amd64 ones to not draw too much of HPE's ire. I might suggest even skipping Itanic.

> Unlike SpaceX’s hangars full of reusable rockets, there’s no building with cameras, spectrometers, telescopes, and spacecraft buses—the core chassis of a satellite platform—lying around waiting to launch.

Not exactly, but communications satellites (and even more LEO constellations) are made in a steady cadence, what's left to do is to qualify the types of cameras, spectrometers, and telescopes for the various missions, and attach them to standard buses with modular power, propulsion and thermal management. It's much more of an engineering problem than a science one.

If you pass a negative number as a string to a function that converts strings representing positive numbers into positive long integers, then yes, it should return an error status instead of the wrong result.

I think the first thing I'd do would be to reflash the TV and turn it into an X terminal. Or the Wayland equivalent.