RISC System Internal SCSI adapter to support more external devices

[Bob Shair]

To summarize this announcement:

The "Internal/External" SCSI adapters will now be able to attach
a total of seven devices, no matter whether internal or external.
It was previously limited to two external devices.

All new machines will be shipped with this facility.  Installed ones
will be altered, at no charge, beginning late in June.

Many users who don't wish to attach more than two external devices
to "Internal/External" adapter will not require this.  If you wish
to have this engineering change made to your installed system, contact
your friendly, neighborhood IBM Representative.

This is especially important to owners of 320s and 320Hs, which have
fewer internal devices.

Bob 

 SCSI DEVICE RESTRICTIONS REMOVED WITH NEW IBM TERMINATOR

   May 17, 1991

   In response to  a recognized requirement from  the field, an
   AWD Engineer has developed an innovative SCSI bus terminator
   which uniquely  conditions the  SCSI bus to  enable extended
   configurations.

   All RISC  System/6000 systems  shipped on  or after  May 17,
   1991 will now support attachment of up to seven SCSI devices
   on the SCSI I/O controllers FC 2828 and FC 2829.  The previ-
   ous restriction of no more than two external SCSI devices on
   any controller which also  supports internal SCSI devices is
   now lifted for these systems.

   Further, if  your customer  has a  previously-installed RISC
   System/6000 and  wishes to  attach additional  external SCSI
   devices which would then cause it to violate the restriction
   for machines  shipped prior to  May 17, 1991, you  should be
   aware that  there is an "As Required" EC available for these
   earlier systems at no charge.  Ask CE to search RETAIN under
   the appropriate  Machine Type for  "FPT TERM" to  obtain the
   correct field bill for the  As Required EC.  The As Required
   EC should be available by late June 1991.

   This increase  in SCSI  attach capability can  be especially
   critical for  some configurations of the  desktop Models 320
   and 320H where Microchannel slot usage is tight, so a second
   SCSI card is not an  option, but the customer requires three
   or more external  devices such as tape,  CD-ROM, or external
   disk in addition to internal SCSI disk drives.

-- 

Bob Shair                          shair at chgvmic1.iinus1.ibm.com
Scientific Computing Specialist    SHAIR at UIUCVMD (bitnet)
IBM Champaign