It's just a bootable ffs filesystem, IIRC. The tape install was 
different, the kernel had a miniroot built into it, etc.. afaik one couldnt
just make a boot tape from the cd. Someone i gave an ultrix cd to 
recently netbooted ultrix from it, ill ask him how he did it. 
if you can write to one of the disks, too, you can dd the cd onto a 
normal disk and boot from it as well. the 4.5 cd is only about 260 megs.

isildur

On Tue, 12 Nov 2002 vance@neurotica.com wrote:

> 
> I have a question for you, that I have been having trouble finding an
> answer for.  How is the ULTRIX 4.5 CD set up?  Is it a set of backup sets
> like VMS?  I need to be able to install on a DECsystem 5840, and the only
> removeable media device it has is a TK70 tape drive.  Is there any way to
> get ULTRIX from a CD onto TK50/TK70?  Do you know where I might be able to
> find reference material as to the PROM syntax so I might be able to boot
> this beast from an InfoServer?
> 
> Peace...  Sridhar
> 
>