Begin with a verbose PRTDIAG:
# /usr/platform/sun4u/sbin/prtdiag -v
Unless you've already customized your root user's command path,
you will need to type the full absolute path for Solaris 8.
... the path to prtdiag was not soft-linked until Solaris 9.
You could also grep yourself through a verbose PRTCONF as well,
although the output from PRTDIAG will probably be sufficient.
Begin with a full ...
# prtconf -v | more
and let it scroll on and on.
The man pages can give additional command switches that may be of value.