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

Thanks for the info guys, but sadly it didn't help at all!  I've tried it on just the clean parallax prototyping board with nothing plugged in, and I get the same problem.  That has the pullup resistor built in, and I've got the power supply set to 7.5v which seems to be giving a steady 5V to the circuit.  Perhaps my SX-Key is broken?

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