RS/6000 530H development

Hi, my name is Matt Erickson, and I have an IBM RS/6000 530H
that I got a while back, and now I have the time to actually
toy with it.  I understand you're always in need to help to
new (old) architectures, and your supported hardware list
shows you don't currently support pre-PowerPC machines like
mine.  I'm new to OS-level programming, and would like to help
out and port NetBSD to the system, however, the biggest
question I have is "where do I begin?"

Thanks,
Matt