If you have an OEM Apple CD drive, ( I've seen it up through the 12x at least) it has an auto termination feature where it senses if it needs to be the terminated device. (a jumper needs to be on the "term power" or just "term" pins, beside the ID jumper pins on the rear of the drive. All I've seen came jumpered from the factory.) If there is another device terminated and it is further from the motherboard physically on the ribbon cable, the CD drive turns its termination off. If the CD drive is the last physically on the cable, it turns it on. Pretty neat feature. If you terminate another device that is closer to the motherboard end of the cable, the CD drive will not be recognized. IIRC: The 7300 ribbon cable goes from the motherboard to the CD drive and then to the hard drive. (located to the left of the floppy drive as seen from the front.)
ID number doesn't matter in termination. To add more confusion, you must have a different # per device on each bus, but you can usually have matching ID #s on the different busses. I.E. Bus 0 may have a device with the same number as a device on Bus 1. There are some devices such as some of the UMax scanners that didn't like sharing a number with any other device, no matter the bus. (My UMax Astra 600s/600S's are that way.) Both ends of the ribbon cable need to be terminated. The Motherboard terminates that end and the last device physically (in the plug on the ribbon cable furthest from the motherboard) must also be terminated no matter what ID number it has. David Allen > Dan S wrote: > >> Also, since it's ID is 4, and the CD is three, which one would get > > >>> terminated? ... (I guess the whole ID 4 thing is confusing me too much). > > > >Right now I've got the HD terminated, and CD-ROM has been untouched (I > >don't know if it's terminated or not, though probably not) This is in a > >7300/200 on the Fast SCSI bus if this matters. > > > >Any help... greatly appreciated, -- 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
