on 11/14/05 4:35 PM, Jeff Walther at [EMAIL PROTECTED] wrote:

>> Date: Mon, 14 Nov 2005 11:58:42 -0600
>> From: <[EMAIL PROTECTED]>
> 
>> on 11/14/05 7:41 AM, [EMAIL PROTECTED] at [EMAIL PROTECTED] wrote:
>> 
> 
>>> internal drives SCSI jumpers to a higher ID? I don't know what the external
>>> drive is set to (old CAi external w/software scsi control).
> 
> I have seen options for setting the SCSI ID using software, however,
> I think that only works with drives which have the option built into
> their firmware, and that was (I believe) limited to certain Quantum
> drives.  I would be sure to set that drive's SCSI ID using a good old
> fashioned jumper.

I agree. Using the switches on the back of an external enclosure or trying
to set an ID via software is no substitute for setting the jumpers manually.

>> My experience has been that when the Mac tries to boot with SCSI drives with
>> duplicate ID's, it just hangs - it won't go to the flashing question mark.
> 
> There are a couple of other possibilities which come up.  Your
> experience is probably the most common, however, duplicated SCSI IDs
> sometimes cause one of the disks to appear about 8 times on the
> desktop.  That's the wierdest.  Another possibility is that one of
> the two disks appears and the other doesn't.
> 
> Jeff Walther

In more than 20 years of dealing with SCSI I've never seen that.  Wild! I
did a little SCSI before I met a Mac - I once designed a fully-populated
triple-wide VME Eurocard SCSI controller for a Navy SONAR system with TTL
and PAL components only to have a NCR single-chip solution released within
days after getting the board working and sent off to production. Damn, I'm
showing my age.

Rick


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