unable to boot sparc64 cd33.iso with Ultra-10

[jurvis lasalle <lasalle@bard.edu>]

<insert typical newbie introduction>
I have heard many good things about OpenBSD and was interested in 
putting it on a new (to me) Ultra-10.
I retrieved the cd33.iso and burned it to disk.  I couldn't boot to the 
disk at first so I upgraded the Flash PROM to the latest available.  
Afterwards I still couldn't boot to the disk so I got a new copy from 
ftp.openbsd.org (making sure that i got sparc64 .iso) and burned 
another copy.  i went on to make two floppies as well from floppy33.fs. 
  No booting, no how.  Here are the messages that I see:

<error_msg>
ok boot cdrom
Boot device: /pci@1f,0/pci@1,1/ide@3/cdrom@2,0:f File and args:
Can't read disk label.
Can't open disk label package

Can't open boot device

ok boot floppy bsd
Boot device: /pci@1f,0/pci@1,1/ebus@1/fdthree File and args: bsd
Bad magic number in disk label
Can't open disk label package

Can't open boot device
</error_msg>

I have verified the md5 checksums and run 'cmp /dev/fd0 floppy33.fs' on 
the floppy.  I'd like to note that i can boot the computer from the 
Solaris 9 installation cd's with 'boot cdrom'.  Anyone know what's 
tripping me up?  Thanks in advance

Jurvis LaSalle