[rescue] two SCSI oddities

[David Rouse]

On Thursday, November 29, 2001, at 07:49  PM, George Adkins wrote:

>> All four drives (narrow SCSI)  in the internal cage of my ss1000 have
>> the "active termination enabled" jumper jumpered. Is this wrong then?
>
> If they are SCA drives, it doesn't make a difference.  SCA drives (in 
> all my
> experience) do not contain termination networks.  However, they often 
> retain
> the jumpers of their non-SCA counterparts.  I would suspect that it is 
> likely
> that the jumpers you have closed are either term-power or if they are 
> indeed
> termination-enable, that they connect to an empty set of solder pads on 
> the
> PCB where termination resistors should be but aren't on the SCA model 
> of the
> drive.
>
> What make/model are the drives?

The connectors are 50 pin ribbon, the drives are Conner CP30540 -- well 
orginally, I've had to replace two of them with drives from old Macs and 
have since started to get grumbling messages every now and then on the 
console. One of the Mac drives is a Quantum Fireball 540S, the other 
(sigh) is a Quantum Maverick 540S -- both taken from the same model 
Mac ... its hard to belive looking at the specs that Apple could 
consider them the same thing.

I think it's the Maverick that is causing the trouble, but I had noticed 
the active termination jumper (set on the orginal drives) and wondered 
if that was a bad thing. Taking Debertin's advice I looked at the 
prtconf -v and it looks like everything on that controller is at 10 
MB/s, except for the CD drive.

--
drouse