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Re:ArcaOS 5.0 now available: new OS/2 distribution by PeCaN on Wednesday May 17, 2017 @05:25PM (#14362934)
A new kernel with SMP support suggests they have at least some source access.
Re:ArcaOS 5.0 now available: new OS/2 distribution by mhd on Wednesday May 17, 2017 @05:56PM (#14363163)
There were versions of OS/2 with SMP support, if I remember correctly.
Re:ArcaOS 5.0 now available: new OS/2 distribution by acdha on Wednesday May 17, 2017 @09:04PM (#14364132)
In 1997 I had a dual Pentium 90 running either OS/2 or BeOS. It was really cool seeing the CPU monitor light up during a big compile.

(I got better at picking operating systems)

Re:ArcaOS 5.0 now available: new OS/2 distribution by PeCaN on Wednesday May 17, 2017 @07:12PM (#14363601)
I thought it was just the PowerPC one (which had a different, Mach-based kernel), but it turns out¹ that it has had some sort of SMP support since 2.11 in 1993.

1. http://www.edm2.com/0509/smp2.html