sylvain maugiron wrote:
> 
> when i'm trying to mount the cdrom on ultrix to copy the diskimage
> with the command
> mount -r -t cdfs -o nodefperm,noversion /dev/rz4c /mnt
> it answer the error cannot mount /dev/rz4c on /mnt: operation not
> supported.
> however, my cdrom's scsi-id is really 4.

What kind of cdrom do you use? It is greatly suggested to use
a DEC cdrom with Ultrix/RISC.
Also the support for cdfs must be compiled into the Ultrix kernel.
Maybe you can rebuild the kernel with "doconfig".

HTH
Dennis