On 19 Jan 2006 16:52:03 -0600, Dave wrote:

Hmm. I'm thinkin' that maybe the easiest way to get what I need is to cut an
old external modem cable, or null modem cable, in half. Checking the web, it
looks like all of those cables use pins 2, 3 and 5, yes?

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Yes but if you use a null modem cable you need to know where the
crossover is.