Maybe there was a "Code Update" utility that IBM used to develop the
scsimode utility ? "Code Update" is scattered throughout the SCSImode documentation...

https://web.archive.org/web/19980520184449/http://index.storsys.ibm.com/hddtech/scsi/utility/SCSIMD10.EXE

Louis Ohland wrote:

Note:  The Adaptec 1542B card requires special EPROMS to function
properly with IBM drives.  The correct microcode for the EPROMS can be obtained from the Adaptec BBS ((408)945-7727) or from your local Adaptec representative.

Wolfgang Gehl wrote:

Surprisingly still online:
ftp://index.storsys.ibm.com

Older versions can be found on archive.org, e.g. with the data sheets
for the old IBM SCSI hard drives:
https://web.archive.org/web/19990202184953/http://index.storsys.ibm.com/hddtech/scsi/3-5inch


And last but not least, the scsimode utility (scsimd10.exe) for
changing the storage capacity of a SCSI hard drive or for
(de)activating the drive's write cache and many other options:
https://web.archive.org/web/19990203204201/http://index.storsys.ibm.com/hddtech/scsi/utility


scsimode works directly with Spock and Cheetah. All other SCSI host
adapters require an ASPI driver. IBM hard drives are recognized, but
hard drives from other manufacturers are also supported.

I use this utility to prepare LVD SCSI disks for use in a 9595.

Regards

Wolfgang

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