The only way to verify the idprom is to reload the relevant bytes,
incl the checksum, then cycle power, reset and see if the settings
are still there.
I've been working through some of my Sun collection over the past
few months and probably done a dozen or more iproms. Started by
epoxying batteries on top the idprom, but current method is to epoxy
a coin cell battery holder onto the end of the package, so that the
battery is replaceable, even with power on. On some sbus machines,
height is limited, so fit onto the end is the only solution and
even that varies with machine type. Using CR2032 cells now, much
higher capacity than original, which should give > 10 years life,
probably more than the remaining life of the machine.
Good luck with it anyway. If you've got that far, should be able
to finish it. The
sunhelp.org and the
classiccmp.org mailing lists
are a good place to keep an eye on as well...
Chris