Normal for regular SCSI cables and adapters.
That pin position is used by the Apple 590-0718-A HDI-30 SCSI Disk Adapter cable, the one you can use to make a Powerbook (14x,150,170 are exceptions, perhaps others) look like a SCSI disk to another Mac. See Pogue and Schorr: Mac Secrets 5th edition, page 576 for the discussion. It is jumpered over to another pin nearby and signals the Powerbook to enter SCSI mode. You can recognize this cable by the presence of all 30 pins on the HDI end and the female SCSI 50 pin connector (same as SCSI devices) on the other end nearby. [
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That pin position is used by the Apple 590-0718-A HDI-30 SCSI Disk Adapter cable, the one you can use to make a Powerbook (14x,150,170 are exceptions, perhaps others) look like a SCSI disk to another Mac. See Pogue and Schorr: Mac Secrets 5th edition, page 576 for the discussion. It is jumpered over to another pin nearby and signals the Powerbook to enter SCSI mode. You can recognize this cable by the presence of all 30 pins on the HDI end and the female SCSI 50 pin connector (same as SCSI devices) on the other end nearby. [
] ]'>