Hello,
The A2090a was the Autobooting version of the A2090 SCSI Controller. At that time the biggest available Hard drives were 40 MB. I never saw this card just the older A2090 version. When Kickstart/Workbench 1.3 was released CBM produced the A2091 SCSI Controller Card.
For some reason I seem to remember the A2090 primarily being used for MFM/RLL ST506 Type Hard Drives.
II migh have some older notes around in my old CBM Tech Note book but will have to do some digging to confirm my information.
Cheers
Shaf
