Well I doubt that your 948 is much older than ours and Stanley (that's his name) runs just fine. He's also configured roughly like yours. I'd check the HPIB addresses on all the drives and then match the address values to the third digit on config. Also confirm that the 2 HPIB interfaces are cabled up to the right drives. Also where's your DAT? It's HPIB also. Once you get 'em up and running... GET RID of the 7937s. They are a hardware failure just waiting to happen. Setup a group of SE-SCSI drives. MUCH better and very very cheap. Wayne