> Same for active SPARC64 desktops. Link?

Not active, sadly, but newer and more powerful that the PowerPC systems of MorphOS, hell yes!

Sun built them until 2008 and my Ultra 5 from 2001 is still a helluva workhorse. MorphOS on SPARC would be interesting if unlikely. As far as I know the SPARC architecture shares a lot of the benefits the PowerPC architecture.

> I've been sure that PowerPC is the biggest desktop after x86/x64.

Moreorless, PowerPC is dead on the workstation/desktop front. I don't see much development from it these days. China is chugging along with MIPS production though. Plus moving to MIPS would grant us access to an abundance of cheap hardware.

> I guess that's more a question of operating system support than of CPU ISA.

Andreas speaks the truth here. It has NOTHING to do with the CPU ISA, this is all handled by the OS.

I like PowerPC, but I fear for its future as a suitable ISA. Moving to MIPS brings a lot of benefits that ARM doesn't have like I said.