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From: fhage@uncmed.med.unc.edu
Newsgroups: comp.periphs.scsi
Subject: WREN VI Jumpers
Message-ID: <169@uncmed.med.unc.edu>
Date: 26 Feb 90 20:02:21 GMT
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Organization: UNC-CH School of Medicine, Office of Information Systems
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The WREN VI documentation (WREN VI SCSI Model 94191 Rev B OEM manual
July 1989) for setting device address jumpers has a serious flaw that
may have lead to the setup problems mentioned previously in this
group.  On page 15 of the manual, that is suplied with the drives, it
shows the drive ID and Option header as having 8 pairs of pins, whereas
there are *9* adjacent pairs of pins on the back of the drive. The
"extra", unshown pair is actually jumper J4 pins.  This makes it very
easy to mistakenly place the jumper on the Motor Start Option pins,
instead of on the device ID bit 1 pins by counting from the wrong side
of the "header". This leaves the drive as device #0, but it does'nt spin up
until the computer sends a start unit command to drive #0. Everyone here
thought it was a hardware/cabling problem until I found the "extra pins".

-Frank Hage (I *KNOW* its device 1! - I jumper'ed them pins myself!)