In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Try looking at 'The I/O expander' at www.njgrp.org/oix/  for what a keyboard and LCD display involve.  While this was written for an SX-28, it could easily be modified to an SX-48.  In that way, you would have twice the RAM for number crunching.   

IMHO, an RPN calculator would be quite interesting and I think the stack approach would be very easy to impliment.  A 4x4 keypad would provide you the function keys along with the number keys.

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