What does SCSI-probe say?

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Tried SCSI probe, but it looks as if the drive isn't connected at all.

Drives generally have a variety of jumper-controlled options for how termination power is to be supplied (e.g., from the host computer, from a local power supply, etc.). If it is currently set to receive term. power from the host, then the system will behave much as you have described.

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Yes, I was going to ask that too. I have a "SCSI System Cable" manual, and it says that if there is no internal drive, a terminator must be connected between the Mac and the drive (unlike the usual way: the end of the chain, or the 2nd connector of the drive).

I don't know if that has anything to do with this, but how do I get termination power from the drive itself? One of my newer SCSI drives (9GB) has such an option, but not on the IBM 80MB drive.