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

Keep in mind that it's not that difficult to do ISR-driven serial with the SX; and SX/B allows one to easily mix assembly and BASIC so the overall programming chore is simplified.  

I've attached a framework to get you started; it allows for half-duplex, ISR-driven serial on a single pin and will work from 1200 to 38.4K baud -- it uses Open True mode so you need to put a pull-up (don't use the internal pull-up) on the serial I/O pin.

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