... 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.

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the enclosure has to provide for termination by way of a CN-50F socket into which a CN-50M terminator can be plugged.

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I believe this is the answer for your drive if there is no apparent external switch. An external terminator. You might try opening the enclosure to see if there is a resistor you can move to terminate the drive. If this is an Apple OEM, then according to their drive manuals these drives could self-terminate for use with Macs like the Plus. You are probably better off getting yourself a couple of external terminators though, lest you have the same problem when you try to use the drive with a later Mac down the road and forget what you've done.