I've just finished a NetBSD installation via FTP, booting from floppies -
   onto a Sparcstation Classic. 900Mb root filesystem, 100 Mb swap, nothing
   else.
   
   When the system is rebooted after installation, it mounts the root
   filesystem read-only and does an fsck .. and then it keeps on going
   into multi-user mode, with the root filesystem still mounted read-only,
   giving messages about how the root filesystem device (root_device) 
   doesn't match the entry ( /dev/sd0a )  in /etc/fstab .
   
   Has anybody else seen this? Did I do something wrong? And is there
   a quick fix?


sounds like the kernel things your root is _not_ sd0a.  what does it print
at the end of it's probe messages, like this:

	root on sd0a dumps on sd0b
	root file system type: ffs