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StarTech.com USB to Serial Adapter - 3 ft / 1m - with DB9 to DB25 Pin Adapter - Prolific PL-2303 - USB to RS232 Adapter Cable - Add an RS232 serial port
C2G 1.5ft USB to Serial Cable - USB to DB9 Serial RS232 Cable - M/M - 26886 - USB Adapters - CDW.com
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Prolific PL2303 USB to UART RS232 Serial Driver v.3.8.25.0, v.3.8.18.0 download for Windows - deviceinbox.com
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Installing The 'Unsupported' Profilic USB-to-Serial Adapter PL-2303HXA & PL-2303X on Windows 8 & 8.1
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