I've yet to delve into this for lack of time, but I believe any 328P based arduino / clone will work. It looks like I'll need some zeners to test but I intend to try with a bare breadboard clone and a FTDI cable.
Edit: one advantage to using a clone that lacks an integral usb>rs232 adapter is that the RTS line can be disconnected, eliminating the microcontroller reset caused when the serial port is opened by the client application.
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