I checked the jumper pins on the hard drive. All jumper pins have no jumpers. Among other things, that means that the HDD SCSI device number is already set to 0, matching the SCSI BIOS.
I see now that I definitely misspoke earlier; the CD drive is not connected to the motherboard. The CD drive is connected to the SCSI card via a ribbon cable with many more wires than 34. The device connections go like this. I had to diagram it because there are so many native cables in the case that taking a good picture is impossible.
Disconnecting the 2 internal SCSI cables from the SCSI card and doing the scan via SCSI Disk Utilities results in the same response: the computer hangs up and I have to push reset.
Here is a picture of the SCSI card with both internal cables disconnected.
Here is the SCSI card user manual:
http://download.adaptec.com/pdfs/user_guides/aha2940u2w_ur.pdf
Here is a troubleshooting article at IBM that has been helping a lot.
https://www.ibm.com/support/pages/troubleshooting-adaptec-scsi-issues
I remember that in the early days, there was nothing in the motherboard BIOS about CD-ROM drives. One would simply attach the CD-ROM drive to the IDE cable (setting master/slave as appropriate), then get DOS to load the CD-ROM driver and MSCDEX.
I see now that I definitely misspoke earlier; the CD drive is not connected to the motherboard. The CD drive is connected to the SCSI card via a ribbon cable with many more wires than 34. The device connections go like this. I had to diagram it because there are so many native cables in the case that taking a good picture is impossible.
Any change if you detach the SCSI cable (at the controller)? Expected would be a scan result that only shows the SCSI card.
Disconnecting the 2 internal SCSI cables from the SCSI card and doing the scan via SCSI Disk Utilities results in the same response: the computer hangs up and I have to push reset.
Here is a picture of the SCSI card with both internal cables disconnected.
Here is the SCSI card user manual:
http://download.adaptec.com/pdfs/user_guides/aha2940u2w_ur.pdf
Here is a troubleshooting article at IBM that has been helping a lot.
https://www.ibm.com/support/pages/troubleshooting-adaptec-scsi-issues
Attachments
Last edited: