You stated that the majority of memory in your case was used for strings for user I/O. In this case it (may) be relatively simple to use an external serial flash for storing strings. These are easy to hook up to the spi port of the msp430 and work with dma. You could store a pointer to the string (location and length) in your code and use a procedure call to "play these" to the serial port for user I/O.
Geoffrey Brown

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