--- Lo'oRiS il Kabukimono <[EMAIL PROTECTED]> wrote: > ah, the structure is this? > > external > | > | > controller > | > | > internal > > so, even if internal are well terminated, since > controller is stupid i must > also terminate the external?
When NOT using any external SCSI devices, you don't need a terminator on the external connector (except it helps on the early IIfx). Since you're using an external CD-ROM it must have a terminator on it. You should not have more than one internal and one external device providing termination power to the bus. SCSI devices usually have three options for termination power, to themselves only, to the bus only or to both. Some devices are configured so that one jumper both provides termination power to the device and enables the onboard terminator. Desktop Mac's built in SCSI is supposed to provide termination power to the bus so that when using only one internal drive and one external device, neither should need to provide termination power. But it looks like some Macs may not provide enough or it's failed completely. So to be sure, always have one internal and one external drive provide termination power to the bus and themselves and all others set to provide their own (unless that setting also enables their onboard terminators). That makes it easier to change things around. ;) The position in the chain of the device providing termination power to the bus doesn't matter, as long as you have one on each side of the controller. Just make sure the terminators or the devices with their terminators enabled are only at the very ends of the chain. ===== "Work it harder make it better do it faster makes us stronger. More than ever hour after our work is never over." Daft Punk __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/ -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> Send list messages to: <mailto:vintage.macs@;mail.maclaunch.com> To unsubscribe, email: <mailto:vintage.macs-off@;mail.maclaunch.com> For digest mode, email: <mailto:vintage.macs-digest@;mail.maclaunch.com> Subscription questions: <mailto:listmom@;lowendmac.com> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
