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Amazon.com: Coolgear 12in. High-Speed USB to RS-232 Serial DB9 Adapter Cable - Windows 7/8 : Electronics
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Amazon.com: Nexhi® Premium High Speed USB 2.0 to Serial RS-232 DB-9 Converter - Supports Windows 7, Vista, XP, 2000, 98, Linux and Mac/USB to Serial Adapter (USB-2920) with FTDI Chipset : Electronics
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USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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