Apple SCSI

[Don]

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.  :-(
>