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-- 25 pin gender changer -> null modem adapter? (http://discussion.visorcentral.com/vcforum/showthread.php?threadid=2283)

I was trying to connect my visor to a usr ext modem(see another posting of mine), and didn't work out, now I'm thinking of DIY changing the 25pin gender changer to a null modem adapter instead of using the one I bought from Radioshack.

I have made some null modem cables for playing C&C many years ago, that was 2->3, 3->2, 7->7, but how about this one for visor? anything special? (the one I bought from radioshack is 2->3, 3->2, 4->5, 5->4, 6&8->20, 20->6&8, 7->7)

TIA for help!