>> In my parts drawer I see that I have one ribbon cable that fits and one
>> with a blanked out hole that doesn't fit the CD drive.  Why are these
>> cables different?  Is it 66 and 133 compatibility?
>
>I think the faster specs call for a missing pin on the connector so that an
>unshrouded connector on the motherboard can be keyed to connect only one
>way.  Your cable probably has a plastic plug in one of the holes that can be
>carefully pried out with a razor blade.

The UATA/66 and faster cables have 80 wires, but the connectors have only 
39 pins. The 40th pin is a "key", but it is not used otherwise.

You can delete that same pin on a 40 wire cable, and the bus will act as 
an UATA/33 or EIDE (16.67 MB/sec) bus, whichever (host or drive) is the 
slowest.


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