ziggy29
Level 2
(293 points)
Q: Terminating a SCSI Chain on a PM 7600
I recently acquired a Power Mac 7600 for a project. I put an IDE ATA card in it and am booting from that and using it (it's much larger and 3x faster than the internal SCSI drive in it). I'd like to remove the SCSI drive completely, but there may be SCSI issues involved since I believe the HDD is at the end of the chain. That would mean the chain would need to terminate at the CDROM rather than the hard disk. For the stock CDROM drives that came with the first generation PCI Power Macs, are there any jumpers or other settings in the drive that will need to change to properly terminate the chain at the CDROM?
Jeff
Level 6
(11,559 points)
Unfortunately, those Apple OEM (Matsushita) SCSI CD-ROM drives didn't have a TE (termination Enable) jumper setting. They have a jumper for TERM PWR, but that's a different setting. As you're aware, the hard drive was always the last device connected to the SCSI ribbon cable in those PCI Power Macs, and enabling termination was accomplished with a jumper. Does your ATA controller PCI card support optical drives? If so, I'd install an ATAPI optical CD-RW or DVD±RW drive. If not, you can install an "IDC 50" plug-in, active terminator on the SCSI ribbon cable's first unused connector after the optical drive.
