Greetings;
  For a network research project I have obtained an underused (!) 
SS20+32Mb+1Gdisk+Sun 4mm tape (Python) on which I've been trying to 
install the NetBSD-1.2BETA stuff on.  I have SunOS4.1.4 on it now (the 
Solaris 2.5 got smushed by someone else) and am trying to install and 
boot miniroot-12.fs.  After writing miniroot onto /dev/rsd0b while
in singleuser mode, I reboot but cannot boot disk:b ..

dialog:

# dd if=/tmp/miniroot-12.fs of=/dev/rsd0b bs=20b conv=sync 
512+0 records in
512+0 records out
# halt
Halted

Protram terminated
ok boot disk:b netbsd -s

<flash>
           SPARCstation 20 ( 1 X RT625 ) blah
 SX video  ROM Rev. 2.22 32Mb blah
  icon     Ethernet address ... blah

Rebooting with command: disk:b netbsd -s
Boot device: /iommu/sbus/espdma@f,400000/esp@f,800000/sd#3,0:b \
  File and args: netbsd -s
<disk click>
open: : No such file or directory
Data Access Exception
ok

I've set sunmon-compat? false and security-mode(?) none
before all this stuff, but just can't seem to get it to work.
Any ideas?  It _looks_ as though the ROM can't read the filesystem
placed therein, but that's just a stab.  If I try to copy and boot
the miniroot from /dev/rsd0h (a big partition) I receive a diagnostic
'Instruction Access Exception' w/o the open: error.

BTW the miniroot-12 is from ftp.netbsd.org and dated Jun28 00:08.

I'm at a loss..

Thanks,

Eric L. Dorman
eld@mpl.ucsd.edu