As per Adaptec documentation, turns out that the Adaptec AHA-2910C SCSI card is not bootable.

So I used the suggestions mentioned in this post:
http://www.knoppix.net/forum/viewtop...ht=loadlin+exe

Now I boot from a DOS floppy.
Instead of using the CDROM, I copied the contents of the
KNOPPIX CD on an 800 Mb FAT partition on the SCSI disk.

(I need the CDROM to be free for other uses.)

I used Adaptec's scsi drivers to boot from the floppy
and access the 800 Mb "C" drive.

Loadlin can boot linux.
In other words, loadlin.exe on the floppy (for DOS) boots Kooppix (on the SCSI hard disk).