[hsnewman]

This is exaggeration, I doubt that it can run AS/400 binaries.

[stingraycharles]

Well looks like qemu does have support S390X, which is pretty impressive.

https://wiki.qemu.org/Documentation/Platforms/S390X

[Teknoman117]

I've actually used that a few times. I've never seen a mainframe (in person), nor do I think I ever will without a career change, but I did need to make some changes to a build system in an open source project that had wide architecture support. I was using qemu to check that all of the binaries for the various supported architectures actually ran in some capacity.

[pabs3]

BTW, there are a few different ways to get access to mainframe hardware rather than using qemu. In short, the Debian porterboxen, the Deb-o-matic service and the IBM LinuxOne cloud.

https://wiki.debian.org/Hardware/Wanted#Available_hardware

[rurban]

The only remaining supported Big Ending architecture today, to test BE quirks.