Re: Need help hooking up old SCSI drives

[Greg Buchner <apple22@mn.rr.com>]

In article <427af823.0411210342.6406f46@posting.google.com>,
 colin_tokyo@hotmail.com (Xerxes409) wrote:

> Can someone tell me just where (and IF it's possible to) to stick the
> two sets of cables? I really do need to be able to manually set
> termination because it's gonna be one of several devices on a chain.
> 
> An old Apple II nerd thanks you kindly.

OK, first, the two sets of three in img_0981.jpg are for the SCSI ID, 
not termination.  From the looks of it, you'd actually use both sets of 
connectors to the SCSI ID section on the drive.  One connector is the 
common, the other selects the various ID combos of 1/2/4.  It can be a 
PITA to set that up right and I just always use jumpers to set the SCSI 
ID directly on the drive.  It seems to be a more certain way to make 
sure the ID is set to what you want so there won't be any conflicts.

If you wanted to hook up those cables for the SCSI ID, with the two 
drives you've shown you could only do it on the Seagate.  Those two 
connectors would go on the 4 2 1 / ADDR connectors on J6 (from 
img_0985.jpg).  I do not know which way they'd go and you'd have to 
experiment.

Second, the Quantum Atlas II 3.5 series drive doesn't look like a normal 
SCSI drive that a GS could handle.  It's talking about differential on 
the drive and while I've never dealt with that, I have a friend who has.  
You either have to have a SCSI card that can handle differential drives 
or you need an adapter to go to normal SCSI.  I do not know what the 
difference is off the top of my head.  You could maybe google the info.

Third, if you're planning a SCSI chain, the best thing to do for 
Termination would be to have an external terminator.  That way you could 
always move it to the end.

Greg B.

PS.  Don't worry about SCSI being confusing...it is at first.  Once you 
get the hang of it, things usually go pretty well.  Also note that there 
is a term floating around the net called SCSI Voodoo.  SCSI can be a 
royal PITA to set up and if you google deep enough, you'll find 
recommendations about sacrificing small animals under the full moon to 
get it work correctly.  ;-)

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