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USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Cable Matters USB to Serial Adapter Cable (USB to RS232, USB to DB9) 3 Feet : Electronics
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StarTech.com USB to Serial RS232 Adapter Cable w/ COM Retention - USB Serial Adapter - serial adapter - USB - RS-232
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