> I wrote a simple program to set  Port Pin 0 in GPIO high on a PIC12C672
> (to light up an LED).  When I run it through the MPLAM simulator and
> step through, I notice that the GPIO register will not change (as seen
> through the Special Function Register Window) no matter how I set those
> bits ("BSF GPIO, 0" or "MOVWF GPIO").

Is the TRIS bit 0 set to 0?

> I also have the same problem when I try to alter the bits in the
> OPTION_REG on a PIC16F84.  I noticed that using the old OPTION command
> will alter the bits, but MOVWF OPTION_REG (with the desired bits in the
> W register) will not.

Check your bank settings.  These are the RP0 and RP1 bits in STATUS.


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