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I've used both the Sunnix add on cards, and found cards with one serial port often have the 9 pins on the motherboard for a second serial port - you just have to find someone, somewhere that sells the ribbon cable to connect the motherboard port and provide a rear of PC serial connector. Honestly last time I looked for the connector cable - its was in a PC sellers big box of throw out junk - right down the bottom. Took about 20 minutes to find in the box and cost $8 - works a treat!
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