Re: Need help hooking up old SCSI drives

["Folkert Rienstra" <see_reply-to@myweb.nl>]

"Greg Buchner" <apple22@mn.rr.com> wrote in message apple22-9853C7.08403521112004@apollo-ge0.rdc-kc.rr.com">news:apple22-9853C7.08403521112004@apollo-ge0.rdc-kc.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.  

Of course it can, unless it is the HVD version, recognizable by a D suffix on the model number.

> 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.  

Only for High Voltage Differential SCSI drives.
That (common ATLAS II) label is not proof that it is such a drive,
it merely indicates that there is such a version also available.

> I do not know what the difference is off the top of my head.  
> You could maybe google the info.

[snip]