Rauf, thats kind of strange becuase if I recall correctly R0 has an iram adress of 0. What I sopposed was that if A and B had iram addresses they should be near 0. And the way the SFR's are listed in the simulator would indicate that they would be negative. Consequently I guesed that A and B do not have iram adresses.

By the way I do not have an assembler.

I beleive I checked the adresses around 0, at least the positive ones.