Denys,

If I'm not mistaken, isn't the interface different between the Differential
and the Single-ended thus not allowing
you to connect the wrong type?

Rick Clark
Senior Systems Analyst
WW&R
Cleveland, Ohio

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of Denys Beauchemin
Sent: Saturday, May 20, 2000 12:58 AM
To: [log in to unmask]
Subject: Re: DDS-4 and SCSI


The difficulty with HP's nomenclature is the fact it hides a vital
component.
 When one talks about FWSCSI on MPE, one is really talking about Fast Wide
Differential (AKA HVD High Voltage Differential) SCSI, as opposed to Fast
Wide
Single-ended (AKA LVD or Low Voltage Differential)SCSI.  Single-ended SCSI
is
HP's nomenclature for Fast Single-ended SCSI-2.  (BTW, the industry is
moving
away from HVD and going to LVD.)

All this to say that if your DDS-4 drive is a Differential SCSI drive, you
should be able to connect it to the FWSCSI.  If it is not differential, DO
NOT
CONNECT IT, its controller will get fried.