I purchased a DB-25 to 50-pin Centronics cable since that seems to be the best way to go. The two external drives I'm looking at are http://www.ebay.com/itm/VINTAGE-APS-External-SCSI-Hard-Drive-APPLE-MACINTOSH-/151788396659?hash=item23574b2073 or http://www.ebay.com/itm/SPIN-MACINTOSH-APPLE-external-hard-drive-/111747084992?hash=item1a04a532c0 since they're at roughly the same (low) price point. It doesn't look like either of them come with a power cable, however. Is there a way to determine what kind of power cable these would need in order to function properly? Can't seem to find anything useful online.