On the page advertising a SCM PCD-50B SCSI Card reader there are some hints given regarding the SCSI bus termination.

That page tells: "APPLE USERS: Some old Apple II scsi cards do not support luns or termination power. you may need to hack a diode for term power. If your controller does NOT support LUNs, I recommend you to order the kit with the PCMCIA to CF adapter. It will allow you to address it as device 2 etc with no LUNs needed." (Note: probably it should read "device 0" or "LUN 0" ?)

Did someone already retrofit term power using a diode?