I have a 7600/SonnetG3. I am running my main internal drive off an Orange Micro OrangeLink+ SCSI card, and until now I've had an older internal drive, terminated, on the built-in SCSI bus. Now I am removing the slow SCSI drive and inserting a new drive on the OrangeLink chain with the main drive.
Does this leave my internal SCSI bus 0, which has just the original 8xCD-Rom on it, unterminated?? The reason I ask is that when I put OS9.1 on the new drive, I am getting a 'bus error' but when I replaced it with OS9.0 it seems to work just fine. I am hypothesizing that 9.1 is more sensitive to SCSI problems...? Just one of the possibilities.
I looked at the pins on the CD-Rom drive and I don't see how to terminate. I see 8 sets of pins: parity, 3 sets for id, one unlabeled, one single pin, another unlabeled, and term power. Only the id pairs are enabled currently. Is there a way to terminate this using the jumper pins? I can't find this info anywhere.
Alternatively, is there such a thing as a terminating plug that will fit on the internal 50-pin SCSI cable?
Termination on a SCSI cable is required at the physical ends of the cable. In the PowerMacs, the motherboard provides termination for the end of the cable plugged into it, so you only have to terminate the other end of the cable. The problems you have seen are probably due to the lack of proper termination. Unfortunately, I have not tried to change the termination on my 9600's CD-ROM, so I can't help you much further. There are termination plugs for the 50 pin cable available.
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