The Sun Ultra 30 is running, turned out that one of the hard drives was shorted and two memory sticks were in back to front. Incredibly the memory seems to be fine.
I just need to fix the NVRam - so a bit of melting and dremeling to do this weekend - and then I have to find the right values to set. Plus I’m guessing the other hard drive is also dead, so I’ll need to work out a solution for that.

