Carroll Grigsby wrote:
Gene:
I went through some Maxtor data sheets, and they say that blue goes to
the motherboard, gray to the slave and black to the master. I noted that
Maxtor refers to the cable as a "UDMA interface cable". My understanding
is that the 80 wire cables came into existence to handle the higher data
speeds required by the UDMA interface, and don't have anything to do
with cable select. Maxtor also states that the supplied cable is to be
That is correct. There are 40 wire cables which are CS capable.
used with either type of jumpering. Although Maxtor does not explictly
If the cable is made properly, then it is compatible with either
CS or M/S jumpering on the drives (if they are made properly).
state that the gray/slave black/master must observed when using
master/slave jumpering, one of my hardware references [1] does say so.
That is unclear to me. The other pins are the same. It might have
something to do with termination, but for several years both floppies
and hard drives have used "close enough" termination, with something
in the middle on every drive.
It's left as an exercise for the reader to dissect a cable and settle
the crossover/straight-through/termination questions. My eyes are too
old for that kind of crap -- especially at this hour.
All one really needs to do is read the spec.
Mike
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