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1 2 3 4 GND CD IN L GND CD IN R 1 2 3 4 CD IN L GND GND CD IN R SIR1: Serial infrared port The mainboard supports a Serial Infrared (SIR1) data port. Infrared ports allow the wireless exchange of information between your computer and similarly equipped devices such as printers, laptops, Personal Digital Assistants (PDAs), and other computers. Pin 1 3 5 Signal NC +5V IRTX Pin 2 4 6 Signal KEY GND IRRX 18
