THX1138 at dakotacom.net
Mon Sep 4 01:42:43 CDT 2006
Roy J. Tellason wrote:
> On Sunday 03 September 2006 04:14 pm, jim stephens wrote:
>> Only when you go from 50 -> 68 pin should you beware of
>> termination on the upper 8 bits added by the extra lines and
>> what you have for an initiator and targets.
>> There is not much science in a wide initiator selecting narrow
>> devices on a chain, but there is when you have wide targets and
>> a narrow initiator.
> What sort of problems would you expect doing this?
Since SCSI devices are selected via individual data bits,
a wide device having an ID > 7 would be selected via DATAn
(where n > 7). A narrow device (initiator) doesn't *have*
those data lines connected to it (hence no way for it to
select a device > 7)
> My first SCSI setup some years back involved a wide drive with an adapter, a
> 50-wire ribbon cable, and an Adaptec 2842 which worked fine until a storm
> rolling through here took out the drive, the 2842, and the MB. :-(
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