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

Fry,
  Any code before "Start:" will never get executed. So your "OUTPUT RB.0" and "INPUT RB.0" never get executed.
  
  HIGH and LOW will force the pin to be an output. "RB.0 = 1" and "RB.0 = 0" do not, they simply set the output latch. So if the pin is an input, you won't see anything on your led.

  The best way to handle this is to DEFINE the pin as an output. As in:

  LEDS    PIN  RB.0  OUTPUT

Bean.

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