>Apple's OEM CD drives are rather unique in that many of them use >selective >termination. With the term power jumped, the CD drive checks >the SCSI >chain and decides if it needs to have termination on or off. >It then >automatically sets itself. if the drive is at the end of the >chain, it >will terminate itself and if in the middle, turn termination >off.
I would like to know where you heard this. I'm almost positive this is false. The TERM POWER jumper is to make a drive provide the termination power on the bus. At least one device on the bus must provide termination voltage. I continually say DO NOT trust a drive's onboard termination. You never know what the quality is. That is the reason the SCSI-3 spec dictates NO onboard termination at all. Internal devices in a Macintosh are tricky because the host adapter's termination is sometimes configured strangely. To be safe, get two discrete ACTIVE terminators and place them on the absolute ends of the bus (only if you have external devices attached, of course.) Make sure that at least one device provides term power. Again, narrow, slow SCSI is very forgiving. But as I heard on a list recently, "It's not that SCSI doesn't work when it should, but that it works when it shouldn't." But if you want to be certain, don't trust a drive's internal termination. _________________________________________________________________ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail -- 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
