locking down scsi device id's in 6.2

[Dave]

Hello,
I've got a situation where three devices, one a scsi tape drive and the 
other two ide burners under scsi emulation with atapicam are fighting for 
scsi id's and i'd like to lock them down to specific id's. When
the tape drive isn't plugged in the burners get 000 and 010 scsi ids, but
when the tape goes in it takes 050 and the burners are on bus2 200 and 210
respectively. I hope this makes sense. I've been over loader and
device.hints as well and i'm lost. I'd appreciate any info on this.
Thanks.
Dave.