Is there any reason why a 40 PIN to 50 PIN SCSI adapter cable would not work with a SCSI2SD and a Powerbook 540?
AFAIK, Both are SE SCSI. I looked at the pinouts of the 40 pin connector on the IBM drive and a 50 pin SCSI interface and made this table. I'm thinking of putting something together and giving it a try. I would match up these pins plus make sure all the grounds are there on the 50 PIN side. There are 4 pins on the 40 pin side with +5V, so I could power the SCSI2SD with those.
I'm not sure what I should do with TERMPWR on the 40 Pin side.
I'm think of using the 90 degree PC mount connectors with 2 rows of pins on a perf board and then just wire this up. That will connect to the ribbon cable in the PB and I can use a 50 pin ribbon cable to connect the SCSI2SD.