Just been looking at some basics in pdfs on re 7600s. Some discussion and a bit of confusion over these issues lately. Looks like after one has fiddled for years, swapping things in and out, better check carefully and get it right, terminate at least at "other" end from the Mac itself. Here it is from one horse's mouth for the 7600 (a user tech spec pdf I have around):
=========== SCSI interfaces: Your computer has two SCSI interfaces: an internal �Fast� SCSI chain and an external standard SCSI chain The internal SCSI chain supports the internal hard disk and CD-ROM drive. An Apple-authorized dealer or service provider can connect one additional 3. 5-inch SCSI device to the internal SCSI interface. The SCSI device must be no more than 1.625 inches (41.3 mm) high. The internal SCSI chain supports �Fast� SCSI, which is capable of transferring data at up to 10 MB per second (twice the rate of the external standard SCSI chain). If you obtain a SCSI device that supports �Fast� SCSI, you should receive faster performance if it is connected to the internal SCSI chain. The external SCSI chain supports up to seven external SCSI devices. All devices on the same SCSI chain must have unique ID numbers, but devices on different SCSI chains may use the same SCSI ID number. (For example, you could have a CD-ROM drive with ID number 3 connected to the internal SCSI chain and a tape drive with ID number 3 connected to the external SCSI chain.) The drives that were installed in your computer at the factory, as well as the computer itself, have already reserved certain SCSI ID numbers. Other ID numbers are available for assignment to SCSI devices that are added after you buy your computer, as described in the following table. SCSI chain SCSI ID number Device Internal* 0 Factory-installed hard disk (terminated) 1 Available 2 Available 3 Factory-installed CD-ROM drive 4 Available 5 Available 6 Available 7 Power Macintosh computer (terminated) External 0 Available 1 Available 2 Available 3 Available 4 Available 5 Available 6 Available 7 Power Macintosh computer (terminated) * Although five SCSI ID numbers are available for assignment, only one other SCSI device can be connected to the internal SCSI chain. IMPORTANT The factory-installed internal hard disk and the Power Macintosh computer are both terminated. If another SCSI device is attached to the internal SCSI interface, it must not be terminated. If you attach a terminated device to the internal SCSI interface, damage to the computer�s main logic board can occur. ================== Note carefully the last warning. As far as I know, it is not so important which device is terminated (which ID or where on the physical chain) as long as there is at least one and only one. If this is not right, someone speak up! David Elmo -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[email protected]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
