Hello,

> Btw, how do you boot from the SCSI CD-ROM ? 
> I have the following connections in the scsi-int cable:
> scsi-int => cdrom => disk1 => disk2
> 
> `boot cd:0 NETBSD.MACPPC' doesn't seem to work (it goes into MacOS).

On which SCSI ID is your CDROM? I'll assume 3 for now. Then you'd boot like this:
boot scsi-int/sd@3:0 netbsd.macppc
There are no useful devaliases for the CDROM in the S900's firmware. You could make them yourself though.

later, when you're done installing you'll probably want to set boot-device to scsi-int/sd@0:0 ( assuming your disk is at ID 0 ) and boot-file to the name of your kernel ( usually netbsd )

have fun
Michael