Re: Another SCSI card question ...

["John King" <joki@eskimo.com>]

Well I don't know most of the answers to the questions.

The more I think about it I sort of forgot a key part -- namely that this is
a 'new' drive and I have not done much testing with it yet.



"David Empson" <dempson@actrix.gen.nz> wrote in message
1ekpurg.12hxduc1vcjgbqN%dempson@actrix.gen.nz">news:1ekpurg.12hxduc1vcjgbqN%dempson@actrix.gen.nz...
> John King <joki@eskimo.com> wrote:
>
> > I had a problem with an Apple SCSI card Rev C (not HS) and it seems to
work
> > now after adding an external  terminating plug to the second port on the
> > external SyQuest ...
> >
> > My question is
> > Should I keep the termination plug on when using this SyQuest with the
Apple
> > *HS* SCSI card?
>
> Almost certainly yes.
>
> There are three questions:
>
> 1. Is the SyQuest terminated internally?  If so, you shouldn't have
> needed to add a terminator to get it to work with the original Apple
> card.

I think it's not terminated internally. It's a PLI (FWIW) 88 meg and all the
switches were in the no termination position. The HS card came straight out
of a new sealed box and was installed as it was shipped.

Also, it 'works' with and without this external termination pack. That is
why I am asking because I would have thought it should not have worked with
internal and an external termination (unless more at the end doesn't
matter).

There is only a single device. I don't know if the SyQuest drive supplies
term power.


>
> 2. Are you connecting more than one device?  If so, the furthest device
> from the computer must be terminated (either internally or externally).
> If you have multiple devices connected to an original Apple card, you
> must ALSO terminate the first device (do not do this with the high-speed
> card).

One device and HS card. How would I terminate the first device anyway?

>
> 3. Do you have a device connected which is supplying power for the
> terminators?  Either the SCSI card itself or at least one of the drives
> must be doing this, or you will have unreliable operation.  I'm not sure
> whether my SyQuest was supplying termination power (I always had another
> drive connected which did this).

I don't know about the card or the SyQuest wrt term power.