I am still trying to boot my Sun 4c, so far without success.

I finally got rarpd and tftp and bootparamd working, so when I saw that 
"Regents of the University" I thought all was well, but later it panicked 
with this message:

panic: nfs_boot: mountd swap, error=72

So what is error 72?  

Here's my bootparams file for the curious:

client	root=b:/tftpboot \
	swap=b:/tftpboot/swapfile

"Swapfile" is a 16 MB plain file.