| From: | Sean Courtney |
| Date: | 3 Jul 2001 at 16:21:45 |
| Subject: | Re: Arright, what's going on here? [SCSI update] |
--- Neil Bothwick <neil@wirenet.co.uk> wrote:
> > 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.
Yeah...like limiting it to ZERO cables. :)
> Can you post a diagram of your layout, describing it in words only is
> going to lead to misunderstandings.
Well, I'll try...
************************
_____________________________________
|
|
____ | _-------------[ <-- internal SCSI terminator
|__6_|---|]----------<
| | \
| | |
| |.-------. |
____ || Hard |--< Leftover SCSI ports
|__3_| || Drive | \___[____[
|`-------'
|
`--------------------------------------
Key:
6 -- external Zip 100 drive, connected to Cyberstorm external SCSI-3
port via DB25-MD68 adaptor; drive set to unit 6, unterminated.
3 -- external Yamaha CRW4416SXZ CD rewriter, daisy-chained to Zip
drive. Cable has MD50 on one end [connected to CD drive] and DB25 on
the other [connected to Zip drive]. Termination switch on drive is set
to "off" position. SCSI-3 active terminator is connected to CD drive
via MD50-MD68 adaptor.
**********************************************
> 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.
D'oh...that means I'll have to spend more bucks...ecch...
> 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.
Did that. Works with nothing. Works with everything but the hard drive.
Whenever the hard drive is there, forget it. But again, I found in the
manual that there is a jumper for "Force Single-Ended Mode."
Oh...finally, now that I have the manual WITH ME, I can proudly post
the make and model of the hard drive! :)
The hard drive is a Compaq BC01821938
And for all of you who are insisting that I need to set the unit ID to
a higher number, it only goes up to 6. So nyaa! :)
> 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.
Actually, the "cables and terminators only" test passed with flying
colors.
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