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well, SCSI-2 *is* "normal" SCSI.
There is SCSI-1 which usually is used for external devices like scanners and uses a 25 pin connector which looks like printer cable (but is not).
SCSI-2 has 50 pins and is used for internal devices like CD-ROMs, CD-writers and old HDDs.
Nowadays SCSI-3 aka UW-SCSI (Ultra Wide) is used for HDDs which have 68pin connectors, or even U2W-SCSI which is twice as fast AFAIK.
With the correct adapters all SCSI standards are compatible to each other. Of course you won't run SCSI-3 speed on a SCSI-2 controller.
IMHO your SCSI-2 drive should perfectly fit on the 2091 controller.
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