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

It's important to work through problems a step at a time.  Once you get the programs above working, have a look at these -- I think this gets you closer to your ultimate goal.  The SX side uses buffered serial so the SX can be doing something else while serial data arrives.  Hardware flow-control is still used to maintain comms between the Stamp and SX.  

The SX demo waits from three bytes, adds them, then sends the result (low byte only) back to the Stamp comparison.  I've even attached a screen shot from my PC so you can see what it looks like when running.

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