funnily enough, solaris 2 was also identifying as sunos 5 depending on what tool you used to query.

sun's pivot from bsd to at&t was a very nice and clean change (I was the one who ended up upgrading our sunos servers to solaris when the time came in the 90's), sequent's switch was a nightmare.

I still miss my e4500, though, but not the noise or electric bill.