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Amazon.com: 6FT DB9 9 Pin to RS232 3.5mm Audio Jack Serial Adapter Cable FTDI Chip DB9-RS232-AJ : Electronics
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StarTech.com 3ft [1m] DB9 to 3.5mm Serial Cable for Serial Device Configuration, RS232 DB9 Male to 3.5mm for Calibrating via Audio Jack (9m351m-rs232-cable) - Walmart.com
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