Odd problem with AHA1542B, Archive tape, and Micropolis disk

[Gary Coffman]

In article <1990Sep19.042306.261 at esegue.segue.boston.ma.us> johnl at esegue.segue.boston.ma.us (John R. Levine) writes:
>I have a 386 box with an Adaptec 1542B controlling a 660MB Micropolis disk.
>Works great.  I'm trying to add an Archive 2150S SCSI tape drive with no
>success.  The tape's in the middle of the cable with no terminator, and has
>its ID set to 5.  I can't get ISC Unix, which is reported to work perfectly
>well with this drive and controller, to admit that the tape is there.
>
>The problem seems to be that the disk is responding to all 8 SCSI addresses.
>When I run the diagnostic in the adapter BIOS, it reports that there is a
>disk at every SCSI address.  The disk has jillions of jumpers on it, but of
>course arrived in a documentation-free condition.  While I attempt to
>explain to my dealer what the problem is and to get them to find a manual
>for the disk, does this problem sound familiar?

I've fought a documentation free Micropolis 1578 for some time now. There
is what appears to be a connector on the rear of the drive to the left
of the SCSI connector. This is actually the drive select header.
Supposedly with no jumpers in place, the drive responds as target 0. With
the leftmost pin pair jumpered, it responds as target 1 etc. I haven't
figured out any of the other jumpers on the drive but this sort of got
it working. I still don't know how to jumper it for sync negotiation
or any other performance enhancing tricks.  If anyone has good documentation 
on the proper jumper settings on this drive, I would appreciate Email.

Gary