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DB9 Male to DB9 Male Null Modem Cable - 6 FT | ShowMeCables.com
StarTech.com 3m RS232 Serial Null Modem Cable, Crossover Serial Cable w/Al-Mylar Shielding, DB9 Serial COM Port Cable Female to Male, Compatible w/DTE Devices | www.publicsector.shidirect.com
Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.