Make your own? Grab the port of an AT board, and the matching connector on the board side, then using the pinout (in the manual or on the manufacturer's website) to rewire it.
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Originally posted by infx708 I got one off an AT board, but it has 10 holes in it. It doesn't work.
Is that a serial port at one end, ribbon cable and a black IDC connector at the other? It has ten holes in it, but only 9 wires to the serial plug. Try it the other way round. If it still doesnt work then the motherboard is wired differently, or the connector you are using is damaged in some way.