on 1/8/03 4:45 AM, Thomas Keller at [EMAIL PROTECTED] wrote: > Now the SCSI termination issue. This is getting humorous, and I think there > is a great deal of confusion going on here with this one. If my memory > serves me correctly, ALL INTERNAL "SCSI" Hard Drives need to be terminated > (or "should" be). Actual physical postion of a SCSI drive on the INTERNAL > ribbon doesn't make a difference for INTERNAL SCSI. All SCSI devices > internal or external need to be properly addressed. Only the main INTERNAL > SCSI HD can get away without jumpers for addressing, since it will default > to id#0. The factory default has always been; (main) HD #0, CD #3,. EXTERNAL > SCSI devices are different. Only the last device on an EXTERNAL SCSI chain > CAN and MUST be terminated if you want everything on the EXTERNAL chain to > operate properly. ALL external devices must be addressed properly also. the > address # does not necessarily have to corspond to the devices actual > physical location on the chain, they all just need different address #'s.
I think you're off the mark on this one. Every SCSI bus must have termination at the ENDS of the chain. SCSI busses are terminated at the motherboard (or card) end and you need ONE device attached to it to be terminated which acts as the other "end". I don't think it needs to be physically at the end of the cable. Also, I believe every device must be setup with a SCSI ID, there is no "default" setting. True, most stock internal drives are set to "0", but I have also seen them set up as ID "1". They do not"default" to any ID, but are set with jumpers as any device. Internal/External SCSI bus is no different. Both ends must be terminated and all devices must have unique ID set. Now some systems share a single SCSI bus for the internal and external drives, while others (like my Umax S900) have two separate SCSI busses on the motherboard allowing more devices to be connected. In either case, you need ONE device connected to the internal chain to be terminated and ONE device connected to the external chain to be terminated. Charles -- 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/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
