In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I modified the Parallax SX/B Help code (4x4 matrix keyboard) to use it with a 3x5 matrix keyboard from Radio Shack (obsolete now - but you may still fine them). The character is transmitted out and sent to a BS2 to be read in. So basically the SX-28 is being used as a matrix keyboard encoder/decoder(?) chip. See attached.

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