| From: | Neil Bothwick |
| Date: | 3 Jul 2001 at 09:09:48 |
| Subject: | Re: Arright, what's going on here? [SCSI update] |
Sean Courtney said,
> Problem: allegedly the Cyberstorm SCSIs don't have termination.
They don't, as it says in the manual, and you don't want them to. with
only one connector, terminating it on board would seriously limit your
cabling options.
> My revised setup looks like this:
> SCSI ribbon is split in a "V," with one port on one end of the V and
> the rest of the ports on the remainder of the V.
> The internal SCSI terminator is connected to the single-port end. The
> hard drive is connected to one of the ports on the other end of the
> cable.
> Connected directly to the external SCSI port via a SCSI-3-to-DB25
> converter is my external Zip 100 drive, unterminated, set to unit 6.
> Daisy-chained to my Zip drive is my external Yamaha CRW4416SXZ. The
> cable between the Zip and the Yamaha is DB25 on one end, MD50 on the
> other. One expert on this list advised me to turn OFF the built-in
> termination on the Yahama and attach an active SCSI-3 terminator to the
> other port on the CD drive. Did that.
Can you post a diagram of your layout, describing it in words only is
going to lead to misunderstandings.
The use of 25 way cable for the Zip doesn't help matters. SCSI-II should
have 50 way cables and connectors. This is why I put my Zip drive at the
end of the chain, and terminated with an external active terminator.
Otherwise you're dropping the whole external part of the chin to a below
spec cable setup.
> I tried countless different things. One time I removed the Zip and the
> Yamaha [AND the INTERNAL terminator] and just attached the external
> SCSI-3 terminator directly to the external SCSI port. The SCSI hard
> drive whirred away for a few minutes, then the access light on the
> drive went out, then the Amiga continued to boot! WOOHOO!!!
> Or...should I say..."Uhh...woo-hoo?"
> Why? Because I couldn't do that again. Immediately I turned off the
> Amiga and reconnected everything and again could get nothing. I again
> tried my remove-everything-but-the-external-SCSI3-terminator trick, but
> it didn't work.
As Steve said, try with nothing. Then add the cable with the two
terminators, than add devices to the cable one at a time. Checking the
version of your cybppc.device is also a good idea. The early versions
were extremely fussy about cabling and termination, even legal setups
failed.
> - Cyberstorm 060/PPC 233 -- manufactured not by phase5 but DCE.
You may find the "cables and terminators only" test fails, because
there's nothing providing term power. If it does, try adding the hard
drive to the cable.
Cheers
Neil
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