First... SCSI has to be terminated on each physical end of the SCSI chain. Typically this means at the motherboard and at the far end of the cable. If you are *replacing* the stock drive, and it is not terminated, use no jumpers on J1. If the existing drive *is* terminated, then place the jumpers as you have illustrated.
Regarding SCSI ID, for ID 0, no jumpers. If other than ID 0, jumper per the spec sheet reproduced on thetechpage site. In answer to your question about "why?", because that's how Apple SCSI works. If you desire to learn more about the intricacies of the SCSI interface, point your browser to: <http://scsifaq.org:9080/scsi_faq/> Jim JCT wrote: > Joe Melinis wrote > Try here: > <http://www.thetechpage.com/cgi-bin/default.cgi> > then pick your drive manufacturer, or try typing > your drive info into the search box. > Joe > =========== > Thanks for this link, Joe, really awesome. > In fact, thanks to everyone that has answered me, I read every post with > great care. > However, I need some help again before putting the seagate in the 7300/180... > First, the start up drive should be BUS 0 ID 0 (at least that's what I > always saw...) > Since there does not seem to have a BUS jumper on the ST15150N, default > should be 0, so we forget it? > As for ID 0, this means I do not put any jumper on J4-11, 10, 9 & 8? > As for J4-1 to 7, I put no jumper there??? > Now, to Terminator! This is J01 which look like this (Courier font please): > o o o > > o o o > > I think that I should set it up with the following jumpers: > o o---o > | > o o o > Why? In fact because I do not know better :-) > 1- the left most vertical jumper to enable drive terminator > (as I understand the start up drive must be terminated)? > 2- the top horizontal jumper because this is default terminator power > from the drive... > AND I do not know why I would choose terminator power from SCSI pin 26 > OR terminator to the SCSI pin 26 > OR terminator power to SCSI and drive ??????? > Answer to the above questions is what I am waiting for before > connecting the drive in the 7300. > However, on a related subject, if one want to explain me how the > ST15150N should be connected (J01) as an external drive with another > external drive actively terminated on the SCSI chain... > Thanks, > JCT > -- 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
