Messages in this thread | | | Date | Thu, 02 Jan 2003 14:40:20 -0800 | From | Ross Biro <> | Subject | Re: UDMA 133 on a 40 pin cable |
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> > #1 How is the 40/80 pin detection done at the hardware level ?
On the motherboard end of the 80 conductor cable, the connector shorts one of the pins to ground (maybe pin 38). The ide controller just checks to see if the pin is pulled low or not. Pulled low = 80 pin. That's one of the reasons it's important to plug IDE cables in the correct way.
Ross
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