Apple IIgs hard drive success

[phogren]

I bought a non-apple SCSI card about a year ago and could never get it to work. I bought an apple SCSI card and external hard drive on Ebay this week and it worked great right from the start on a IIgs rom 01
I swapped hard drives and got it partioned and formatted. I then swapped the apple controller with the non-apple controller and it worked great - go figure.
The second hard drive is SCSI ID 4. It's a ST138N and doesn't go higher than 4 on the pins. Can I jumper 4 and 2 to make it ID 6 so it will auto-boot?

 

[HoJoPo]

Yes, the SCSI ID pins are bits of the ID number, so 4 and 2 together will give you 6. The pins are 1, 2 and 4, coding IDs 0 through 7.

 

[RWallmow]

Most Apple II SCSI cards are quite particular about bus termination, many do not provide termination power, so my bet is the termination jumper was set differently and that's why it worked right away for you, with only one device in the chain SCSI ID shouldn't matter as long as it's not on the same ID as the card, which is usually 7 (though it's usually configurable with jumpers on the card).

 

[retrogear]

Chinook SCSI Utilities is the best software to detect otherwise undetectable drives. Google for CSU.SHK