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

John,
  In my experience if MCLR is not connected the SX will not program either. 
 
Orig, 
  Make SURE you have the SX-Key OSC1 pin going to OSC1 on the SX chip, and OSC2 on the SX-Key going to OSC2 on the SX chip.
  It will NOT program if they are reversed.

Bean.

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