i also have a sun sparcstation 2 with 425M hd (w/sled),
some memory
sticks (one stick is bad for sure) with a dual sbus video card (cg6?),
floppy drive. the NVRAM is bad. i think i have a sun keyboard too. ss2
for $5 and keyboard is $10. plus shipping. this is *as is* no
guarantees.
You can connect an external battery to those NVRAM chips and program them
from the openboot prompt. I did it in a couple of
sparcstation 1s a while
back. Instructions are available on a couple of web sites
that I can't
find the addresses for at the moment.
You have to cut the plastic away at one end to expose the battery contacts,
cut through to disconnect the dead battery, and solder a CR2032 or similar
battery in place. Just don't remove the entire plastic top of the chip,
there's also a crystal in there. I made that mistake on the first one I
did, resoldering the crystal in place was a prick of a job.