on 5/12/05 10:57 AM, Ron at [EMAIL PROTECTED] wrote:
> ron > > SCSI is much simpler than you all think it is: > > The SCSI chain needs termination at each end. > Etc. > ron > >> >> *I checked two other CD drives and saw termination jumpers on them. >> That seems to fly against what has been discussed, however, I re-read >> Glen's post, that Apple CDD's have no termin.jumper, only Term.Power, >> and whether it is On or Off is okay. I saw HD pin prs. TE and TP; termin. >> -enabled, and termination-power. Can someone explain the differences? >> Some HD's are terminated w/resistor packs, parallel w/SCSI connector >> (no jumer pins.. oh boy); watch for such when using two devices in the >> same chain, to avoid double termination. At least, that is what I think. All of the Apple SCSI CD-ROMs that I own, from a 300i 2X to the CR 8012 12X have termination jumpers on them. In fairness, Glen may have mistaken Apple IDE CD-ROMs (which have Master and Slave jumpers as opposed to Termination jumpers) with Apple SCSI CD-ROMs. For the TE and TP jumpers. The best thing to do is to check the PDF for your HD (or your CD-ROM, burner, etc.). Search the manufacturer's website. The manual will have that information. The above by Ron is correct. You only need termination at the _ends_ of the chain and the motherboard or PCI card is already terminated. Only the last drive on the chain needs to be terminated, regardless of the number. However, if the drive is not a modern one (last 5 years or so) the internal termination of the hard drive, CD _may_ not be good enough or be nonfunctional, which requires external termination (a passthrough terminator, for example). The standard starting point for finding solutions for SCSI problems is to attach each device singly, see if it works and check its ID number by, for instance, Drive Setup. Sincerely yours, Grizzlygiant -- 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
