At 10:24 AM +1100 05/19/2005, David Elmo wrote:
> From: [EMAIL PROTECTED]
> SCSI is easy.
If it was so easy how come it gives us all such headaches? It is not so much
the basics that is in sensible dispute (each device must have a unique ID,
the ends of the chain must be terminated) but in the implementation on
particular chains and devices and the peculiarities of the different types
of SCSI and the different types of termination.
I honestly don't know why people have so many problems. I fool with
SCSI often, in many diff configs, without problems.
hum. I guess part of it is cabling quality. SCSI is a fast
interface that runs at a fairly high frequency. As such, the signals
WANT to leak out of the cables, so you should always use high quality
well-shielded SCSI cables. If I see one that's been bent around too
tightly, or pinched in any way, I just toss it. When buying SCSI
cables, don't let price be your guide - those $50+ cables from places
like CompUSA are a ripoff. I've found that that the $5 to $20 cables
from Cyberguys work just fine. http://www.cyberguys.com/
Anyway, I noticed that on one of my CD SCSIs there was a pin pair marked
"term power" and another was "termination" Most of my other CD SCSIs had
only "Term power" marked on one pin pair, no mention of "termination" on any
other pin pair. What gives here?
All built-in SCSI-only Power Mac systems provide internal SCSI
termination power.
The Power Mac systems which include an IDE interface DO NOT supply
term power on the built-in SCSI (so you have to set the jumpers).
If the Power Mac has a PCI-based SCSI card, then it probably provides
the term power, but you should verify that in the specific card's
specs.
- Dan.
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