Alex Carver wrote:
--- On Fri, 8/21/09, mark.rice wrote:
Finally, I wondered if the serial ribbon cable had the proper
pin-out for the motherboard header.... no, it didn't. It wasn't
even close, and I kick myself for not checking that. But who would
make their own standard, eh?
That's a little surprising considering there is a standard for the
serial port pinout. It was a one-to-one mapping. Pin one of the
header went to pin one of the D-shell connector. Pin 10 was to be
blank and used as a polarity key with a matching plug in the
connector hole.
The other cable is typically to make it easy for use with IDC
connectors, just clamp one on each end. I'm sure both made perfectly
good sense to the engineers involved, just a different viewpoint (a
perfect example of the difference between an internal and external
interface ... ;)
I always made a point to mark my serial cables as 'A' or 'B' just to
make sure they didn't get mixed up.
... Niall
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