My question is, why? Not all the releases are worth running. Only the
decent milestones are worth installing. Solaris 2.5.1 IIRC is the last
version to run on sparc pizza boxes (5/10/20s) and possibly earier;
Solaris 9 runs quite happily on sparc pizza boxes with decent memory.
I think it runs all sun4m systems. I have not compared speed with
2.5.1. But Solaris 9 is still supported with patches and security
releases etc.
Dan