One of our tape marketing experts has the following comment to your question:

   "The 3590 (both models B11 and B1A) are supported on the RS/6000 7013-J50.
The Magstar 3590 drive requires a SCSI-2 Fast Wide Differential system
attachment (adapter).  I believe the internal SCSI on the J50 is SCSI-2 Fast
Single-ended.  Therefore, I would recommend adding the fc#2412 adapter to the
J50, and the 3590 can be attached to that adapter with an interposer (fc# 9702
on the 3590).   The AIX device driver (ATAPE) comes with the 3590-B11 as
fc#9603, or with the 3494-L1x (for 3590-B1A) as fc#5212.  ATAPE can also be
downloaded from the ftp site:    index.storsys.ibm.com     ...directory:
/devdrvr"

Regards,
Nancy Young

Email: youngny AT us.ibm DOT com

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        ADSM-L AT VM.MARIST DOT EDU
        02/03/98 02:53 AM
Please respond to ADSM-L AT VM.MARIST DOT EDU @ internet

To: ADSM-L AT VM.MARIST DOT EDU @ internet
cc:
Subject: 3590 on RS/6000-J50

I have a RS/6000 model J50 with only the internal SCSI attached to port 7. I
also have a magstar 3590 unit tape.

I was wondering if anybody (specially IBM) could tell me if it is technically
"possible" to connect the 3590 on the intenal SCSI, via the external adapter
available.

I have already done this "workaround" on a J40 with a 3590. The only problem is
that I have to POWER_ON the J40 before, and then start the 3590 and run the
cfgmgr command. I know this is not the "recommended" way on connecting the
device.

As I am just testing the device, I would like to know whether I would
experience any problem with the J50 that could DAMAGE it, if I insist on
connecting the 3590.

IBM, your comments would be very much appreciated.

Thanks,
Armando Lemos
Deutsche Bank