The ATMega128 is one that I've worked with that has 2 UARTs. Search ATMega128 on ebay. There are many development boards for the ATMEga128 [some already have the 9pin D connector in place for both UARTs. [Non-text portions of this message have been removed]
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Re:AVR with 2 UART
2009-01-07 by David Appleton