So can the Portable (5120 or 5125) use SCSI Disk mode or not? According to this Wiki entry it can "through a 3rd party kit." Sadly, they offer no details about such a kit.

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Yes. I added that Wiki entry, one of the few with a citation! If you followed the link to the reference, it would have sent you to this Apple Developer Note, not only supporting the claim, but providing more detailed information.