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

I hadn't included the R1000 emulator because originally they emulated it at the logic gate level and it literally took a week to boot. It looks like they now have a more traditional instruction-level emulator that is supposedly comparable to the real hardware in speed, so I guess I should try to install that.

I think a major reason that no AS/400 emulator exists is because people are afraid of IBM sending them a C&D, although I'm not sure if IBM would care all that much if somebody wrote an emulator for IMPI AS/400s. Those haven't been supported for well over 2 decades AFAIK.

I do know somebody is slowly working on S/32 and S/34 emulators, but they haven't shared either because both apparently are still somewhat flaky. Hopefully they release them at some point. The entire midrange/office computer category is very under-preserved. The only such machines represented in the OS museum currently are HP3000 and S/3.

I've never seen images anywhere for NonStop, VOS, or NIROS, nor do emulators exist for the original hardware they ran on. Later versions of NonStop and VOS run on x86, but I'm not sure if they run under virtualization.

> 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).

> Tandem's NonStop

I'd second this. Of course, there would need to be 3 emulators - the original proprietary CISC systems, the tightly-lockstepped MIPS systems, and the loosely-lockstepped Itanium systems.

HPE still sells NonStop on X86-64 systems now, including virtualized NonStop as a Service "cloud" offerings.

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

As a former Data General engineer, I too would like to see some love for RDOS and AOS. And also their diagnostic tool ADES which was a specialised OS in its own right, and ICOS.

I guess you don't happen to have copies of them lying around, do you?

No, sadly not.