>Our alternative is to run at 3.3, but a 6 MHZ which slows down the '57,
>cuts the baud rate to 4800, and otherwise should have minimal effects.

Is it really not possible to patch the code to change the baud rate divisor 
back to 9600B ? You wouldn't even need the source code, a quick run through 
a disassembler would find the constants to patch. 

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